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4620 lines
144 KiB
4620 lines
144 KiB
/**
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* @license
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* Lo-Dash 1.3.1 (Custom Build) <http://lodash.com/>
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* Build: `lodash underscore exports="amd,commonjs,global,node" -o ./dist/lodash.underscore.js`
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* Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.5.1 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <http://lodash.com/license>
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*/
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;(function(window) {
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/** Used as a safe reference for `undefined` in pre ES5 environments */
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var undefined;
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/** Used to generate unique IDs */
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var idCounter = 0;
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/** Used internally to indicate various things */
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var indicatorObject = {};
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/** Used to prefix keys to avoid issues with `__proto__` and properties on `Object.prototype` */
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var keyPrefix = +new Date + '';
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/** Used to match "interpolate" template delimiters */
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var reInterpolate = /<%=([\s\S]+?)%>/g;
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/** Used to ensure capturing order of template delimiters */
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var reNoMatch = /($^)/;
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/** Used to match unescaped characters in compiled string literals */
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var reUnescapedString = /['\n\r\t\u2028\u2029\\]/g;
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/** `Object#toString` result shortcuts */
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var argsClass = '[object Arguments]',
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arrayClass = '[object Array]',
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boolClass = '[object Boolean]',
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dateClass = '[object Date]',
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funcClass = '[object Function]',
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numberClass = '[object Number]',
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objectClass = '[object Object]',
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regexpClass = '[object RegExp]',
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stringClass = '[object String]';
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/** Used to determine if values are of the language type Object */
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var objectTypes = {
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'boolean': false,
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'function': true,
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'object': true,
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'number': false,
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'string': false,
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'undefined': false
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};
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/** Used to escape characters for inclusion in compiled string literals */
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var stringEscapes = {
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'\\': '\\',
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"'": "'",
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'\n': 'n',
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'\r': 'r',
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'\t': 't',
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'\u2028': 'u2028',
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'\u2029': 'u2029'
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};
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/** Detect free variable `exports` */
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var freeExports = objectTypes[typeof exports] && exports;
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/** Detect free variable `module` */
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var freeModule = objectTypes[typeof module] && module && module.exports == freeExports && module;
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/** Detect free variable `global` from Node.js or Browserified code and use it as `window` */
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var freeGlobal = objectTypes[typeof global] && global;
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if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal)) {
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window = freeGlobal;
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}
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/*--------------------------------------------------------------------------*/
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/**
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* The base implementation of `_.indexOf` without support for binary searches
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* or `fromIndex` constraints.
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*
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* @private
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* @param {Array} array The array to search.
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* @param {Mixed} value The value to search for.
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* @param {Number} [fromIndex=0] The index to search from.
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* @returns {Number} Returns the index of the matched value or `-1`.
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*/
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function baseIndexOf(array, value, fromIndex) {
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var index = (fromIndex || 0) - 1,
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length = array ? array.length : 0;
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while (++index < length) {
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if (array[index] === value) {
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return index;
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}
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}
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return -1;
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}
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/**
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* Used by `sortBy` to compare transformed `collection` elements, stable sorting
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* them in ascending order.
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*
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* @private
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* @param {Object} a The object to compare to `b`.
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* @param {Object} b The object to compare to `a`.
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* @returns {Number} Returns the sort order indicator of `1` or `-1`.
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*/
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function compareAscending(a, b) {
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var ac = a.criteria,
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bc = b.criteria;
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// ensure a stable sort in V8 and other engines
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// http://code.google.com/p/v8/issues/detail?id=90
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if (ac !== bc) {
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if (ac > bc || typeof ac == 'undefined') {
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return 1;
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}
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if (ac < bc || typeof bc == 'undefined') {
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return -1;
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}
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}
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// The JS engine embedded in Adobe applications like InDesign has a buggy
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// `Array#sort` implementation that causes it, under certain circumstances,
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// to return the same value for `a` and `b`.
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// See https://github.com/jashkenas/underscore/pull/1247
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return a.index - b.index;
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}
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/**
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* Used by `template` to escape characters for inclusion in compiled
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* string literals.
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*
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* @private
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* @param {String} match The matched character to escape.
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* @returns {String} Returns the escaped character.
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*/
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function escapeStringChar(match) {
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return '\\' + stringEscapes[match];
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}
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/**
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* A no-operation function.
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*
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* @private
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*/
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function noop() {
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// no operation performed
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}
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/*--------------------------------------------------------------------------*/
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/**
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* Used for `Array` method references.
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*
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* Normally `Array.prototype` would suffice, however, using an array literal
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* avoids issues in Narwhal.
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*/
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var arrayRef = [];
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/** Used for native method references */
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var objectProto = Object.prototype;
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/** Used to restore the original `_` reference in `noConflict` */
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var oldDash = window._;
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/** Used to detect if a method is native */
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var reNative = RegExp('^' +
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String(objectProto.valueOf)
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.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
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.replace(/valueOf|for [^\]]+/g, '.+?') + '$'
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);
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/** Native method shortcuts */
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var ceil = Math.ceil,
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floor = Math.floor,
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hasOwnProperty = objectProto.hasOwnProperty,
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push = arrayRef.push,
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toString = objectProto.toString,
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unshift = arrayRef.unshift;
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/* Native method shortcuts for methods with the same name as other `lodash` methods */
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var nativeBind = reNative.test(nativeBind = toString.bind) && nativeBind,
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nativeCreate = reNative.test(nativeCreate = Object.create) && nativeCreate,
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nativeIsArray = reNative.test(nativeIsArray = Array.isArray) && nativeIsArray,
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nativeIsFinite = window.isFinite,
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nativeIsNaN = window.isNaN,
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nativeKeys = reNative.test(nativeKeys = Object.keys) && nativeKeys,
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nativeMax = Math.max,
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nativeMin = Math.min,
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nativeRandom = Math.random,
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nativeSlice = arrayRef.slice;
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/** Detect various environments */
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var isIeOpera = reNative.test(window.attachEvent),
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isV8 = nativeBind && !/\n|true/.test(nativeBind + isIeOpera);
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/*--------------------------------------------------------------------------*/
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/**
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* Creates a `lodash` object which wraps the given value to enable method
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* chaining.
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*
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* In addition to Lo-Dash methods, wrappers also have the following `Array` methods:
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* `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, `splice`,
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* and `unshift`
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*
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* Chaining is supported in custom builds as long as the `value` method is
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* implicitly or explicitly included in the build.
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*
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* The chainable wrapper functions are:
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* `after`, `assign`, `bind`, `bindAll`, `bindKey`, `chain`, `compact`,
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* `compose`, `concat`, `countBy`, `createCallback`, `curry`, `debounce`,
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* `defaults`, `defer`, `delay`, `difference`, `filter`, `flatten`, `forEach`,
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* `forEachRight`, `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `functions`,
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* `groupBy`, `indexBy`, `initial`, `intersection`, `invert`, `invoke`, `keys`,
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* `map`, `max`, `memoize`, `merge`, `min`, `object`, `omit`, `once`, `pairs`,
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* `partial`, `partialRight`, `pick`, `pluck`, `pull`, `push`, `range`, `reject`,
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* `remove`, `rest`, `reverse`, `shuffle`, `slice`, `sort`, `sortBy`, `splice`,
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* `tap`, `throttle`, `times`, `toArray`, `transform`, `union`, `uniq`, `unshift`,
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* `unzip`, `values`, `where`, `without`, `wrap`, and `zip`
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*
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* The non-chainable wrapper functions are:
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* `clone`, `cloneDeep`, `contains`, `escape`, `every`, `find`, `findIndex`,
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* `findKey`, `findLast`, `findLastIndex`, `findLastKey`, `has`, `identity`,
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* `indexOf`, `isArguments`, `isArray`, `isBoolean`, `isDate`, `isElement`,
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* `isEmpty`, `isEqual`, `isFinite`, `isFunction`, `isNaN`, `isNull`, `isNumber`,
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* `isObject`, `isPlainObject`, `isRegExp`, `isString`, `isUndefined`, `join`,
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* `lastIndexOf`, `mixin`, `noConflict`, `parseInt`, `pop`, `random`, `reduce`,
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* `reduceRight`, `result`, `shift`, `size`, `some`, `sortedIndex`, `runInContext`,
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* `template`, `unescape`, `uniqueId`, and `value`
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*
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* The wrapper functions `first` and `last` return wrapped values when `n` is
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* provided, otherwise they return unwrapped values.
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*
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* @name _
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* @constructor
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* @category Chaining
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* @param {Mixed} value The value to wrap in a `lodash` instance.
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* @returns {Object} Returns a `lodash` instance.
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* @example
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*
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* var wrapped = _([1, 2, 3]);
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*
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* // returns an unwrapped value
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* wrapped.reduce(function(sum, num) {
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* return sum + num;
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* });
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* // => 6
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*
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* // returns a wrapped value
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* var squares = wrapped.map(function(num) {
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* return num * num;
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* });
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*
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* _.isArray(squares);
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* // => false
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*
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* _.isArray(squares.value());
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* // => true
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*/
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function lodash(value) {
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return (value instanceof lodash)
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? value
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: new lodashWrapper(value);
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}
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/**
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* A fast path for creating `lodash` wrapper objects.
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*
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* @private
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* @param {Mixed} value The value to wrap in a `lodash` instance.
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* @param {Boolean} chainAll A flag to enable chaining for all methods
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* @returns {Object} Returns a `lodash` instance.
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*/
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function lodashWrapper(value, chainAll) {
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this.__chain__ = !!chainAll;
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this.__wrapped__ = value;
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}
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// ensure `new lodashWrapper` is an instance of `lodash`
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lodashWrapper.prototype = lodash.prototype;
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/**
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* An object used to flag environments features.
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*
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* @static
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* @memberOf _
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* @type Object
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*/
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var support = {};
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(function() {
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var object = { '0': 1, 'length': 1 };
|
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|
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/**
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* Detect if `Function#bind` exists and is inferred to be fast (all but V8).
|
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*
|
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* @memberOf _.support
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* @type Boolean
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*/
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support.fastBind = nativeBind && !isV8;
|
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|
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/**
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* Detect if `Array#shift` and `Array#splice` augment array-like objects correctly.
|
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*
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* Firefox < 10, IE compatibility mode, and IE < 9 have buggy Array `shift()`
|
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* and `splice()` functions that fail to remove the last element, `value[0]`,
|
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* of array-like objects even though the `length` property is set to `0`.
|
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* The `shift()` method is buggy in IE 8 compatibility mode, while `splice()`
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* is buggy regardless of mode in IE < 9 and buggy in compatibility mode in IE 9.
|
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*
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* @memberOf _.support
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* @type Boolean
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*/
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support.spliceObjects = (arrayRef.splice.call(object, 0, 1), !object[0]);
|
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}(1));
|
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|
|
/**
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|
* By default, the template delimiters used by Lo-Dash are similar to those in
|
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* embedded Ruby (ERB). Change the following template settings to use alternative
|
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* delimiters.
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*
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* @static
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* @memberOf _
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* @type Object
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*/
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lodash.templateSettings = {
|
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|
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/**
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* Used to detect `data` property values to be HTML-escaped.
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*
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* @memberOf _.templateSettings
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* @type RegExp
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*/
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'escape': /<%-([\s\S]+?)%>/g,
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|
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/**
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* Used to detect code to be evaluated.
|
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*
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* @memberOf _.templateSettings
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* @type RegExp
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*/
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'evaluate': /<%([\s\S]+?)%>/g,
|
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|
|
/**
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* Used to detect `data` property values to inject.
|
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*
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* @memberOf _.templateSettings
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* @type RegExp
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*/
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'interpolate': reInterpolate,
|
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|
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/**
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* Used to reference the data object in the template text.
|
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*
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* @memberOf _.templateSettings
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* @type String
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*/
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'variable': ''
|
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};
|
|
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/*--------------------------------------------------------------------------*/
|
|
|
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/**
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* The base implementation of `_.createCallback` without support for creating
|
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* "_.pluck" or "_.where" style callbacks.
|
|
*
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|
* @private
|
|
* @param {Mixed} [func=identity] The value to convert to a callback.
|
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* @param {Mixed} [thisArg] The `this` binding of the created callback.
|
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* @param {Number} [argCount] The number of arguments the callback accepts.
|
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* @returns {Function} Returns a callback function.
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*/
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function baseCreateCallback(func, thisArg, argCount) {
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if (typeof func != 'function') {
|
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return identity;
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}
|
|
// exit early if there is no `thisArg`
|
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if (typeof thisArg == 'undefined') {
|
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return func;
|
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}
|
|
switch (argCount) {
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|
case 1: return function(value) {
|
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return func.call(thisArg, value);
|
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};
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case 2: return function(a, b) {
|
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return func.call(thisArg, a, b);
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};
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case 3: return function(value, index, collection) {
|
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return func.call(thisArg, value, index, collection);
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};
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case 4: return function(accumulator, value, index, collection) {
|
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return func.call(thisArg, accumulator, value, index, collection);
|
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};
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}
|
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return bind(func, thisArg);
|
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}
|
|
|
|
/**
|
|
* The base implementation of `_.flatten` without support for callback
|
|
* shorthands or `thisArg` binding.
|
|
*
|
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* @private
|
|
* @param {Array} array The array to flatten.
|
|
* @param {Boolean} [isShallow=false] A flag to restrict flattening to a single level.
|
|
* @param {Boolean} [isArgArrays=false] A flag to restrict flattening to arrays and `arguments` objects.
|
|
* @param {Number} [fromIndex=0] The index to start from.
|
|
* @returns {Array} Returns a new flattened array.
|
|
*/
|
|
function baseFlatten(array, isShallow, isArgArrays, fromIndex) {
|
|
var index = (fromIndex || 0) - 1,
|
|
length = array ? array.length : 0,
|
|
result = [];
|
|
|
|
while (++index < length) {
|
|
var value = array[index];
|
|
// recursively flatten arrays (susceptible to call stack limits)
|
|
if (value && typeof value == 'object' && (isArray(value) || isArguments(value))) {
|
|
push.apply(result, isShallow ? value : baseFlatten(value, isShallow, isArgArrays));
|
|
} else if (!isArgArrays) {
|
|
result.push(value);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* The base implementation of `_.isEqual`, without support for `thisArg` binding,
|
|
* that allows partial "_.where" style comparisons.
|
|
*
|
|
* @private
|
|
* @param {Mixed} a The value to compare.
|
|
* @param {Mixed} b The other value to compare.
|
|
* @param {Function} [callback] The function to customize comparing values.
|
|
* @param {Function} [isWhere=false] A flag to indicate performing partial comparisons.
|
|
* @param {Array} [stackA=[]] Tracks traversed `a` objects.
|
|
* @param {Array} [stackB=[]] Tracks traversed `b` objects.
|
|
* @returns {Boolean} Returns `true` if the values are equivalent, else `false`.
|
|
*/
|
|
function baseIsEqual(a, b, stackA, stackB) {
|
|
if (a === b) {
|
|
return a !== 0 || (1 / a == 1 / b);
|
|
}
|
|
var type = typeof a,
|
|
otherType = typeof b;
|
|
|
|
if (a === a &&
|
|
!(a && objectTypes[type]) &&
|
|
!(b && objectTypes[otherType])) {
|
|
return false;
|
|
}
|
|
if (a == null || b == null) {
|
|
return a === b;
|
|
}
|
|
var className = toString.call(a),
|
|
otherClass = toString.call(b);
|
|
|
|
if (className != otherClass) {
|
|
return false;
|
|
}
|
|
switch (className) {
|
|
case boolClass:
|
|
case dateClass:
|
|
return +a == +b;
|
|
|
|
case numberClass:
|
|
return a != +a
|
|
? b != +b
|
|
: (a == 0 ? (1 / a == 1 / b) : a == +b);
|
|
|
|
case regexpClass:
|
|
case stringClass:
|
|
return a == String(b);
|
|
}
|
|
var isArr = className == arrayClass;
|
|
if (!isArr) {
|
|
if (hasOwnProperty.call(a, '__wrapped__ ') || b instanceof lodash) {
|
|
return baseIsEqual(a.__wrapped__ || a, b.__wrapped__ || b, stackA, stackB);
|
|
}
|
|
if (className != objectClass) {
|
|
return false;
|
|
}
|
|
var ctorA = a.constructor,
|
|
ctorB = b.constructor;
|
|
|
|
if (ctorA != ctorB && !(
|
|
isFunction(ctorA) && ctorA instanceof ctorA &&
|
|
isFunction(ctorB) && ctorB instanceof ctorB
|
|
)) {
|
|
return false;
|
|
}
|
|
}
|
|
stackA || (stackA = []);
|
|
stackB || (stackB = []);
|
|
|
|
var length = stackA.length;
|
|
while (length--) {
|
|
if (stackA[length] == a) {
|
|
return stackB[length] == b;
|
|
}
|
|
}
|
|
var result = true,
|
|
size = 0;
|
|
|
|
stackA.push(a);
|
|
stackB.push(b);
|
|
|
|
if (isArr) {
|
|
size = b.length;
|
|
result = size == a.length;
|
|
|
|
if (result) {
|
|
while (size--) {
|
|
if (!(result = baseIsEqual(a[size], b[size], stackA, stackB))) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
forIn(b, function(value, key, b) {
|
|
if (hasOwnProperty.call(b, key)) {
|
|
size++;
|
|
return !(result = hasOwnProperty.call(a, key) && baseIsEqual(a[key], value, stackA, stackB)) && indicatorObject;
|
|
}
|
|
});
|
|
|
|
if (result) {
|
|
forIn(a, function(value, key, a) {
|
|
if (hasOwnProperty.call(a, key)) {
|
|
return !(result = --size > -1) && indicatorObject;
|
|
}
|
|
});
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* The base implementation of `_.uniq` without support for callback shorthands
|
|
* or `thisArg` binding.
|
|
*
|
|
* @private
|
|
* @param {Array} array The array to process.
|
|
* @param {Boolean} [isSorted=false] A flag to indicate that `array` is sorted.
|
|
* @param {Function} [callback] The function called per iteration.
|
|
* @returns {Array} Returns a duplicate-value-free array.
|
|
*/
|
|
function baseUniq(array, isSorted, callback) {
|
|
var index = -1,
|
|
indexOf = getIndexOf(),
|
|
length = array ? array.length : 0,
|
|
result = [],
|
|
seen = callback ? [] : result;
|
|
|
|
while (++index < length) {
|
|
var value = array[index],
|
|
computed = callback ? callback(value, index, array) : value;
|
|
|
|
if (isSorted
|
|
? !index || seen[seen.length - 1] !== computed
|
|
: indexOf(seen, computed) < 0
|
|
) {
|
|
if (callback) {
|
|
seen.push(computed);
|
|
}
|
|
result.push(value);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates a function that aggregates a collection, creating an object composed
|
|
* of keys generated from the results of running each element of the collection
|
|
* through a callback. The given `setter` function sets the keys and values
|
|
* of the composed object.
|
|
*
|
|
* @private
|
|
* @param {Function} setter The setter function.
|
|
* @returns {Function} Returns the new aggregator function.
|
|
*/
|
|
function createAggregator(setter) {
|
|
return function(collection, callback, thisArg) {
|
|
var result = {};
|
|
callback = createCallback(callback, thisArg, 3);
|
|
forEach(collection, function(value, key, collection) {
|
|
key = String(callback(value, key, collection));
|
|
setter(result, value, key, collection);
|
|
});
|
|
return result;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Creates a function that, when called, either curries or invokes `func`
|
|
* with an optional `this` binding and partially applied arguments.
|
|
*
|
|
* @private
|
|
* @param {Function|String} func The function or method name to reference.
|
|
* @param {Number} bitmask The bitmask of method flags to compose.
|
|
* The bitmask may be composed of the following flags:
|
|
* 1 - `_.bind`
|
|
* 2 - `_.bindKey`
|
|
* 4 - `_.curry`
|
|
* 8 - `_.curry` (bound)
|
|
* 16 - `_.partial`
|
|
* 32 - `_.partialRight`
|
|
* @param {Array} [partialArgs] An array of arguments to prepend to those
|
|
* provided to the new function.
|
|
* @param {Array} [partialRightArgs] An array of arguments to append to those
|
|
* provided to the new function.
|
|
* @param {Mixed} [thisArg] The `this` binding of `func`.
|
|
* @param {Number} [arity] The arity of `func`.
|
|
* @returns {Function} Returns the new bound function.
|
|
*/
|
|
function createBound(func, bitmask, partialArgs, partialRightArgs, thisArg, arity) {
|
|
var isBind = bitmask & 1,
|
|
isBindKey = bitmask & 2,
|
|
isCurry = bitmask & 4,
|
|
isCurryBound = bitmask & 8,
|
|
isPartial = bitmask & 16,
|
|
isPartialRight = bitmask & 32;
|
|
|
|
if (!isBindKey && !isFunction(func)) {
|
|
throw new TypeError;
|
|
}
|
|
// use `Function#bind` if it exists and is fast
|
|
// (in V8 `Function#bind` is slower except when partially applied)
|
|
if (isBind && !(isBindKey || isCurry || isPartialRight) &&
|
|
(support.fastBind || (nativeBind && partialArgs.length))) {
|
|
var args = [func, thisArg];
|
|
push.apply(args, partialArgs);
|
|
var bound = nativeBind.call.apply(nativeBind, args);
|
|
}
|
|
else {
|
|
bound = function() {
|
|
// `Function#bind` spec
|
|
// http://es5.github.io/#x15.3.4.5
|
|
var args = arguments,
|
|
thisBinding = isBind ? thisArg : this;
|
|
|
|
if (partialArgs) {
|
|
unshift.apply(args, partialArgs);
|
|
}
|
|
if (partialRightArgs) {
|
|
push.apply(args, partialRightArgs);
|
|
}
|
|
if (isCurry && args.length < arity) {
|
|
bitmask |= 16 & ~32
|
|
return createBound(func, (isCurryBound ? bitmask : bitmask & ~3), args, null, thisArg, arity);
|
|
}
|
|
if (isBindKey) {
|
|
func = thisBinding[key];
|
|
}
|
|
if (this instanceof bound) {
|
|
// ensure `new bound` is an instance of `func`
|
|
thisBinding = createObject(func.prototype);
|
|
|
|
// mimic the constructor's `return` behavior
|
|
// http://es5.github.io/#x13.2.2
|
|
var result = func.apply(thisBinding, args);
|
|
return isObject(result) ? result : thisBinding;
|
|
}
|
|
return func.apply(thisBinding, args);
|
|
};
|
|
}
|
|
if (isBindKey) {
|
|
var key = thisArg;
|
|
thisArg = func;
|
|
}
|
|
return bound;
|
|
}
|
|
|
|
/**
|
|
* Creates a new object with the specified `prototype`.
|
|
*
|
|
* @private
|
|
* @param {Object} prototype The prototype object.
|
|
* @returns {Object} Returns the new object.
|
|
*/
|
|
function createObject(prototype) {
|
|
return isObject(prototype) ? nativeCreate(prototype) : {};
|
|
}
|
|
// fallback for browsers without `Object.create`
|
|
if (!nativeCreate) {
|
|
createObject = function(prototype) {
|
|
if (isObject(prototype)) {
|
|
noop.prototype = prototype;
|
|
var result = new noop;
|
|
noop.prototype = null;
|
|
}
|
|
return result || {};
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Used by `escape` to convert characters to HTML entities.
|
|
*
|
|
* @private
|
|
* @param {String} match The matched character to escape.
|
|
* @returns {String} Returns the escaped character.
|
|
*/
|
|
function escapeHtmlChar(match) {
|
|
return htmlEscapes[match];
|
|
}
|
|
|
|
/**
|
|
* Gets the appropriate "indexOf" function. If the `_.indexOf` method is
|
|
* customized, this method returns the custom method, otherwise it returns
|
|
* the `baseIndexOf` function.
|
|
*
|
|
* @private
|
|
* @returns {Function} Returns the "indexOf" function.
|
|
*/
|
|
function getIndexOf() {
|
|
var result = (result = lodash.indexOf) === indexOf ? baseIndexOf : result;
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Used by `unescape` to convert HTML entities to characters.
|
|
*
|
|
* @private
|
|
* @param {String} match The matched character to unescape.
|
|
* @returns {String} Returns the unescaped character.
|
|
*/
|
|
function unescapeHtmlChar(match) {
|
|
return htmlUnescapes[match];
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Checks if `value` is an `arguments` object.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true` if the `value` is an `arguments` object, else `false`.
|
|
* @example
|
|
*
|
|
* (function() { return _.isArguments(arguments); })(1, 2, 3);
|
|
* // => true
|
|
*
|
|
* _.isArguments([1, 2, 3]);
|
|
* // => false
|
|
*/
|
|
function isArguments(value) {
|
|
return (value && typeof value == 'object') ? toString.call(value) == argsClass : false;
|
|
}
|
|
// fallback for browsers that can't detect `arguments` objects by [[Class]]
|
|
if (!isArguments(arguments)) {
|
|
isArguments = function(value) {
|
|
return (value && typeof value == 'object') ? hasOwnProperty.call(value, 'callee') : false;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is an array.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type Function
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true` if the `value` is an array, else `false`.
|
|
* @example
|
|
*
|
|
* (function() { return _.isArray(arguments); })();
|
|
* // => false
|
|
*
|
|
* _.isArray([1, 2, 3]);
|
|
* // => true
|
|
*/
|
|
var isArray = nativeIsArray || function(value) {
|
|
return (value && typeof value == 'object') ? toString.call(value) == arrayClass : false;
|
|
};
|
|
|
|
/**
|
|
* A fallback implementation of `Object.keys` which produces an array of the
|
|
* given object's own enumerable property names.
|
|
*
|
|
* @private
|
|
* @type Function
|
|
* @param {Object} object The object to inspect.
|
|
* @returns {Array} Returns an array of property names.
|
|
*/
|
|
var shimKeys = function(object) {
|
|
var index, iterable = object, result = [];
|
|
if (!iterable) return result;
|
|
if (!(objectTypes[typeof object])) return result;
|
|
for (index in iterable) {
|
|
if (hasOwnProperty.call(iterable, index)) {
|
|
result.push(index);
|
|
}
|
|
}
|
|
return result
|
|
};
|
|
|
|
/**
|
|
* Creates an array composed of the own enumerable property names of an object.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The object to inspect.
|
|
* @returns {Array} Returns an array of property names.
|
|
* @example
|
|
*
|
|
* _.keys({ 'one': 1, 'two': 2, 'three': 3 });
|
|
* // => ['one', 'two', 'three'] (order is not guaranteed)
|
|
*/
|
|
var keys = !nativeKeys ? shimKeys : function(object) {
|
|
if (!isObject(object)) {
|
|
return [];
|
|
}
|
|
return nativeKeys(object);
|
|
};
|
|
|
|
/**
|
|
* Used to convert characters to HTML entities:
|
|
*
|
|
* Though the `>` character is escaped for symmetry, characters like `>` and `/`
|
|
* don't require escaping in HTML and have no special meaning unless they're part
|
|
* of a tag or an unquoted attribute value.
|
|
* http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact")
|
|
*/
|
|
var htmlEscapes = {
|
|
'&': '&',
|
|
'<': '<',
|
|
'>': '>',
|
|
'"': '"',
|
|
"'": ''',
|
|
'/': '/'
|
|
};
|
|
|
|
/** Used to convert HTML entities to characters */
|
|
var htmlUnescapes = invert(htmlEscapes);
|
|
|
|
/** Used to match HTML entities and HTML characters */
|
|
var reEscapedHtml = RegExp('(' + keys(htmlUnescapes).join('|') + ')', 'g'),
|
|
reUnescapedHtml = RegExp('[' + keys(htmlEscapes).join('') + ']', 'g');
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Assigns own enumerable properties of source object(s) to the destination
|
|
* object. Subsequent sources will overwrite property assignments of previous
|
|
* sources. If a callback is provided it will be executed to produce the
|
|
* assigned values. The callback is bound to `thisArg` and invoked with two
|
|
* arguments; (objectValue, sourceValue).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type Function
|
|
* @alias extend
|
|
* @category Objects
|
|
* @param {Object} object The destination object.
|
|
* @param {Object} [source1, source2, ...] The source objects.
|
|
* @param {Function} [callback] The function to customize assigning values.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Object} Returns the destination object.
|
|
* @example
|
|
*
|
|
* _.assign({ 'name': 'moe' }, { 'age': 40 });
|
|
* // => { 'name': 'moe', 'age': 40 }
|
|
*
|
|
* var defaults = _.partialRight(_.assign, function(a, b) {
|
|
* return typeof a == 'undefined' ? b : a;
|
|
* });
|
|
*
|
|
* var food = { 'name': 'apple' };
|
|
* defaults(food, { 'name': 'banana', 'type': 'fruit' });
|
|
* // => { 'name': 'apple', 'type': 'fruit' }
|
|
*/
|
|
function assign(object) {
|
|
if (!object) {
|
|
return object;
|
|
}
|
|
for (var argsIndex = 1, argsLength = arguments.length; argsIndex < argsLength; argsIndex++) {
|
|
var iterable = arguments[argsIndex];
|
|
if (iterable) {
|
|
for (var key in iterable) {
|
|
object[key] = iterable[key];
|
|
}
|
|
}
|
|
}
|
|
return object;
|
|
}
|
|
|
|
/**
|
|
* Creates a clone of `value`. If `deep` is `true` nested objects will also
|
|
* be cloned, otherwise they will be assigned by reference. If a callback
|
|
* is provided it will be executed to produce the cloned values. If the
|
|
* callback returns `undefined` cloning will be handled by the method instead.
|
|
* The callback is bound to `thisArg` and invoked with one argument; (value).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to clone.
|
|
* @param {Boolean} [deep=false] A flag to indicate a deep clone.
|
|
* @param {Function} [callback] The function to customize cloning values.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the cloned `value`.
|
|
* @example
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* var shallow = _.clone(stooges);
|
|
* shallow[0] === stooges[0];
|
|
* // => true
|
|
*
|
|
* var deep = _.clone(stooges, true);
|
|
* deep[0] === stooges[0];
|
|
* // => false
|
|
*
|
|
* _.mixin({
|
|
* 'clone': _.partialRight(_.clone, function(value) {
|
|
* return _.isElement(value) ? value.cloneNode(false) : undefined;
|
|
* })
|
|
* });
|
|
*
|
|
* var clone = _.clone(document.body);
|
|
* clone.childNodes.length;
|
|
* // => 0
|
|
*/
|
|
function clone(value) {
|
|
return isObject(value)
|
|
? (isArray(value) ? nativeSlice.call(value) : assign({}, value))
|
|
: value;
|
|
}
|
|
|
|
/**
|
|
* Assigns own enumerable properties of source object(s) to the destination
|
|
* object for all destination properties that resolve to `undefined`. Once a
|
|
* property is set, additional defaults of the same property will be ignored.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type Function
|
|
* @category Objects
|
|
* @param {Object} object The destination object.
|
|
* @param {Object} [source1, source2, ...] The source objects.
|
|
* @param- {Object} [guard] Allows working with `_.reduce` without using
|
|
* their `key` and `object` arguments as sources.
|
|
* @returns {Object} Returns the destination object.
|
|
* @example
|
|
*
|
|
* var food = { 'name': 'apple' };
|
|
* _.defaults(food, { 'name': 'banana', 'type': 'fruit' });
|
|
* // => { 'name': 'apple', 'type': 'fruit' }
|
|
*/
|
|
function defaults(object) {
|
|
if (!object) {
|
|
return object;
|
|
}
|
|
for (var argsIndex = 1, argsLength = arguments.length; argsIndex < argsLength; argsIndex++) {
|
|
var iterable = arguments[argsIndex];
|
|
if (iterable) {
|
|
for (var key in iterable) {
|
|
if (typeof object[key] == 'undefined') {
|
|
object[key] = iterable[key];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return object;
|
|
}
|
|
|
|
/**
|
|
* Iterates over own and inherited enumerable properties of an object,
|
|
* executing the callback for each property. The callback is bound to `thisArg`
|
|
* and invoked with three arguments; (value, key, object). Callbacks may exit
|
|
* iteration early by explicitly returning `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type Function
|
|
* @category Objects
|
|
* @param {Object} object The object to iterate over.
|
|
* @param {Function} [callback=identity] The function called per iteration.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Object} Returns `object`.
|
|
* @example
|
|
*
|
|
* function Dog(name) {
|
|
* this.name = name;
|
|
* }
|
|
*
|
|
* Dog.prototype.bark = function() {
|
|
* console.log('Woof, woof!');
|
|
* };
|
|
*
|
|
* _.forIn(new Dog('Dagny'), function(value, key) {
|
|
* console.log(key);
|
|
* });
|
|
* // => logs 'bark' and 'name' (order is not guaranteed)
|
|
*/
|
|
var forIn = function(collection, callback) {
|
|
var index, iterable = collection, result = iterable;
|
|
if (!iterable) return result;
|
|
if (!objectTypes[typeof iterable]) return result;
|
|
for (index in iterable) {
|
|
if (callback(iterable[index], index, collection) === indicatorObject) return result;
|
|
}
|
|
return result
|
|
};
|
|
|
|
/**
|
|
* Iterates over own enumerable properties of an object, executing the callback
|
|
* for each property. The callback is bound to `thisArg` and invoked with three
|
|
* arguments; (value, key, object). Callbacks may exit iteration early by
|
|
* explicitly returning `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type Function
|
|
* @category Objects
|
|
* @param {Object} object The object to iterate over.
|
|
* @param {Function} [callback=identity] The function called per iteration.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Object} Returns `object`.
|
|
* @example
|
|
*
|
|
* _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) {
|
|
* console.log(key);
|
|
* });
|
|
* // => logs '0', '1', and 'length' (order is not guaranteed)
|
|
*/
|
|
var forOwn = function(collection, callback) {
|
|
var index, iterable = collection, result = iterable;
|
|
if (!iterable) return result;
|
|
if (!objectTypes[typeof iterable]) return result;
|
|
for (index in iterable) {
|
|
if (hasOwnProperty.call(iterable, index)) {
|
|
if (callback(iterable[index], index, collection) === indicatorObject) return result;
|
|
}
|
|
}
|
|
return result
|
|
};
|
|
|
|
/**
|
|
* Creates a sorted array of property names of all enumerable properties,
|
|
* own and inherited, of `object` that have function values.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias methods
|
|
* @category Objects
|
|
* @param {Object} object The object to inspect.
|
|
* @returns {Array} Returns an array of property names that have function values.
|
|
* @example
|
|
*
|
|
* _.functions(_);
|
|
* // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...]
|
|
*/
|
|
function functions(object) {
|
|
var result = [];
|
|
forIn(object, function(value, key) {
|
|
if (isFunction(value)) {
|
|
result.push(key);
|
|
}
|
|
});
|
|
return result.sort();
|
|
}
|
|
|
|
/**
|
|
* Checks if the specified object `property` exists and is a direct property,
|
|
* instead of an inherited property.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The object to check.
|
|
* @param {String} property The property to check for.
|
|
* @returns {Boolean} Returns `true` if key is a direct property, else `false`.
|
|
* @example
|
|
*
|
|
* _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b');
|
|
* // => true
|
|
*/
|
|
function has(object, property) {
|
|
return object ? hasOwnProperty.call(object, property) : false;
|
|
}
|
|
|
|
/**
|
|
* Creates an object composed of the inverted keys and values of the given object.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The object to invert.
|
|
* @returns {Object} Returns the created inverted object.
|
|
* @example
|
|
*
|
|
* _.invert({ 'first': 'moe', 'second': 'larry' });
|
|
* // => { 'moe': 'first', 'larry': 'second' }
|
|
*/
|
|
function invert(object) {
|
|
var index = -1,
|
|
props = keys(object),
|
|
length = props.length,
|
|
result = {};
|
|
|
|
while (++index < length) {
|
|
var key = props[index];
|
|
result[object[key]] = key;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is a boolean value.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true` if the `value` is a boolean value, else `false`.
|
|
* @example
|
|
*
|
|
* _.isBoolean(null);
|
|
* // => false
|
|
*/
|
|
function isBoolean(value) {
|
|
return value === true || value === false || toString.call(value) == boolClass;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is a date.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true` if the `value` is a date, else `false`.
|
|
* @example
|
|
*
|
|
* _.isDate(new Date);
|
|
* // => true
|
|
*/
|
|
function isDate(value) {
|
|
return value ? (typeof value == 'object' && toString.call(value) == dateClass) : false;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is a DOM element.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true` if the `value` is a DOM element, else `false`.
|
|
* @example
|
|
*
|
|
* _.isElement(document.body);
|
|
* // => true
|
|
*/
|
|
function isElement(value) {
|
|
return value ? value.nodeType === 1 : false;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is empty. Arrays, strings, or `arguments` objects with a
|
|
* length of `0` and objects with no own enumerable properties are considered
|
|
* "empty".
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Array|Object|String} value The value to inspect.
|
|
* @returns {Boolean} Returns `true` if the `value` is empty, else `false`.
|
|
* @example
|
|
*
|
|
* _.isEmpty([1, 2, 3]);
|
|
* // => false
|
|
*
|
|
* _.isEmpty({});
|
|
* // => true
|
|
*
|
|
* _.isEmpty('');
|
|
* // => true
|
|
*/
|
|
function isEmpty(value) {
|
|
if (!value) {
|
|
return true;
|
|
}
|
|
if (isArray(value) || isString(value)) {
|
|
return !value.length;
|
|
}
|
|
for (var key in value) {
|
|
if (hasOwnProperty.call(value, key)) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Performs a deep comparison between two values to determine if they are
|
|
* equivalent to each other. If a callback is provided it will be executed
|
|
* to compare values. If the callback returns `undefined` comparisons will
|
|
* be handled by the method instead. The callback is bound to `thisArg` and
|
|
* invoked with two arguments; (a, b).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} a The value to compare.
|
|
* @param {Mixed} b The other value to compare.
|
|
* @param {Function} [callback] The function to customize comparing values.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Boolean} Returns `true` if the values are equivalent, else `false`.
|
|
* @example
|
|
*
|
|
* var moe = { 'name': 'moe', 'age': 40 };
|
|
* var copy = { 'name': 'moe', 'age': 40 };
|
|
*
|
|
* moe == copy;
|
|
* // => false
|
|
*
|
|
* _.isEqual(moe, copy);
|
|
* // => true
|
|
*
|
|
* var words = ['hello', 'goodbye'];
|
|
* var otherWords = ['hi', 'goodbye'];
|
|
*
|
|
* _.isEqual(words, otherWords, function(a, b) {
|
|
* var reGreet = /^(?:hello|hi)$/i,
|
|
* aGreet = _.isString(a) && reGreet.test(a),
|
|
* bGreet = _.isString(b) && reGreet.test(b);
|
|
*
|
|
* return (aGreet || bGreet) ? (aGreet == bGreet) : undefined;
|
|
* });
|
|
* // => true
|
|
*/
|
|
function isEqual(a, b) {
|
|
return baseIsEqual(a, b);
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is, or can be coerced to, a finite number.
|
|
*
|
|
* Note: This is not the same as native `isFinite` which will return true for
|
|
* booleans and empty strings. See http://es5.github.io/#x15.1.2.5.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true` if the `value` is finite, else `false`.
|
|
* @example
|
|
*
|
|
* _.isFinite(-101);
|
|
* // => true
|
|
*
|
|
* _.isFinite('10');
|
|
* // => true
|
|
*
|
|
* _.isFinite(true);
|
|
* // => false
|
|
*
|
|
* _.isFinite('');
|
|
* // => false
|
|
*
|
|
* _.isFinite(Infinity);
|
|
* // => false
|
|
*/
|
|
function isFinite(value) {
|
|
return nativeIsFinite(value) && !nativeIsNaN(parseFloat(value));
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is a function.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true` if the `value` is a function, else `false`.
|
|
* @example
|
|
*
|
|
* _.isFunction(_);
|
|
* // => true
|
|
*/
|
|
function isFunction(value) {
|
|
return typeof value == 'function';
|
|
}
|
|
// fallback for older versions of Chrome and Safari
|
|
if (isFunction(/x/)) {
|
|
isFunction = function(value) {
|
|
return typeof value == 'function' && toString.call(value) == funcClass;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is the language type of Object.
|
|
* (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true` if the `value` is an object, else `false`.
|
|
* @example
|
|
*
|
|
* _.isObject({});
|
|
* // => true
|
|
*
|
|
* _.isObject([1, 2, 3]);
|
|
* // => true
|
|
*
|
|
* _.isObject(1);
|
|
* // => false
|
|
*/
|
|
function isObject(value) {
|
|
// check if the value is the ECMAScript language type of Object
|
|
// http://es5.github.io/#x8
|
|
// and avoid a V8 bug
|
|
// http://code.google.com/p/v8/issues/detail?id=2291
|
|
return !!(value && objectTypes[typeof value]);
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is `NaN`.
|
|
*
|
|
* Note: This is not the same as native `isNaN` which will return `true` for
|
|
* `undefined` and other non-numeric values. See http://es5.github.io/#x15.1.2.4.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true` if the `value` is `NaN`, else `false`.
|
|
* @example
|
|
*
|
|
* _.isNaN(NaN);
|
|
* // => true
|
|
*
|
|
* _.isNaN(new Number(NaN));
|
|
* // => true
|
|
*
|
|
* isNaN(undefined);
|
|
* // => true
|
|
*
|
|
* _.isNaN(undefined);
|
|
* // => false
|
|
*/
|
|
function isNaN(value) {
|
|
// `NaN` as a primitive is the only value that is not equal to itself
|
|
// (perform the [[Class]] check first to avoid errors with some host objects in IE)
|
|
return isNumber(value) && value != +value;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is `null`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true` if the `value` is `null`, else `false`.
|
|
* @example
|
|
*
|
|
* _.isNull(null);
|
|
* // => true
|
|
*
|
|
* _.isNull(undefined);
|
|
* // => false
|
|
*/
|
|
function isNull(value) {
|
|
return value === null;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is a number.
|
|
*
|
|
* Note: `NaN` is considered a number. See http://es5.github.io/#x8.5.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true` if the `value` is a number, else `false`.
|
|
* @example
|
|
*
|
|
* _.isNumber(8.4 * 5);
|
|
* // => true
|
|
*/
|
|
function isNumber(value) {
|
|
return typeof value == 'number' || toString.call(value) == numberClass;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is a regular expression.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true` if the `value` is a regular expression, else `false`.
|
|
* @example
|
|
*
|
|
* _.isRegExp(/moe/);
|
|
* // => true
|
|
*/
|
|
function isRegExp(value) {
|
|
return (value && objectTypes[typeof value]) ? toString.call(value) == regexpClass : false;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is a string.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true` if the `value` is a string, else `false`.
|
|
* @example
|
|
*
|
|
* _.isString('moe');
|
|
* // => true
|
|
*/
|
|
function isString(value) {
|
|
return typeof value == 'string' || toString.call(value) == stringClass;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is `undefined`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true` if the `value` is `undefined`, else `false`.
|
|
* @example
|
|
*
|
|
* _.isUndefined(void 0);
|
|
* // => true
|
|
*/
|
|
function isUndefined(value) {
|
|
return typeof value == 'undefined';
|
|
}
|
|
|
|
/**
|
|
* Creates a shallow clone of `object` excluding the specified properties.
|
|
* Property names may be specified as individual arguments or as arrays of
|
|
* property names. If a callback is provided it will be executed for each
|
|
* property of `object` omitting the properties the callback returns truthy
|
|
* for. The callback is bound to `thisArg` and invoked with three arguments;
|
|
* (value, key, object).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The source object.
|
|
* @param {Function|String} callback|[prop1, prop2, ...] The properties to omit
|
|
* or the function called per iteration.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Object} Returns an object without the omitted properties.
|
|
* @example
|
|
*
|
|
* _.omit({ 'name': 'moe', 'age': 40 }, 'age');
|
|
* // => { 'name': 'moe' }
|
|
*
|
|
* _.omit({ 'name': 'moe', 'age': 40 }, function(value) {
|
|
* return typeof value == 'number';
|
|
* });
|
|
* // => { 'name': 'moe' }
|
|
*/
|
|
function omit(object) {
|
|
var indexOf = getIndexOf(),
|
|
props = baseFlatten(arguments, true, false, 1),
|
|
result = {};
|
|
|
|
forIn(object, function(value, key) {
|
|
if (indexOf(props, key) < 0) {
|
|
result[key] = value;
|
|
}
|
|
});
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates a two dimensional array of an object's key-value pairs,
|
|
* i.e. `[[key1, value1], [key2, value2]]`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The object to inspect.
|
|
* @returns {Array} Returns new array of key-value pairs.
|
|
* @example
|
|
*
|
|
* _.pairs({ 'moe': 30, 'larry': 40 });
|
|
* // => [['moe', 30], ['larry', 40]] (order is not guaranteed)
|
|
*/
|
|
function pairs(object) {
|
|
var index = -1,
|
|
props = keys(object),
|
|
length = props.length,
|
|
result = Array(length);
|
|
|
|
while (++index < length) {
|
|
var key = props[index];
|
|
result[index] = [key, object[key]];
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates a shallow clone of `object` composed of the specified properties.
|
|
* Property names may be specified as individual arguments or as arrays of
|
|
* property names. If a callback is provided it will be executed for each
|
|
* property of `object` picking the properties the callback returns truthy
|
|
* for. The callback is bound to `thisArg` and invoked with three arguments;
|
|
* (value, key, object).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The source object.
|
|
* @param {Array|Function|String} callback|[prop1, prop2, ...] The function
|
|
* called per iteration or property names to pick, specified as individual
|
|
* property names or arrays of property names.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Object} Returns an object composed of the picked properties.
|
|
* @example
|
|
*
|
|
* _.pick({ 'name': 'moe', '_userid': 'moe1' }, 'name');
|
|
* // => { 'name': 'moe' }
|
|
*
|
|
* _.pick({ 'name': 'moe', '_userid': 'moe1' }, function(value, key) {
|
|
* return key.charAt(0) != '_';
|
|
* });
|
|
* // => { 'name': 'moe' }
|
|
*/
|
|
function pick(object) {
|
|
var index = -1,
|
|
props = baseFlatten(arguments, true, false, 1),
|
|
length = props.length,
|
|
result = {};
|
|
|
|
while (++index < length) {
|
|
var prop = props[index];
|
|
if (prop in object) {
|
|
result[prop] = object[prop];
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates an array composed of the own enumerable property values of `object`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The object to inspect.
|
|
* @returns {Array} Returns an array of property values.
|
|
* @example
|
|
*
|
|
* _.values({ 'one': 1, 'two': 2, 'three': 3 });
|
|
* // => [1, 2, 3] (order is not guaranteed)
|
|
*/
|
|
function values(object) {
|
|
var index = -1,
|
|
props = keys(object),
|
|
length = props.length,
|
|
result = Array(length);
|
|
|
|
while (++index < length) {
|
|
result[index] = object[props[index]];
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Checks if a given value is present in a collection using strict equality
|
|
* for comparisons, i.e. `===`. If `fromIndex` is negative, it is used as the
|
|
* offset from the end of the collection.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias include
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Mixed} target The value to check for.
|
|
* @param {Number} [fromIndex=0] The index to search from.
|
|
* @returns {Boolean} Returns `true` if the `target` element is found, else `false`.
|
|
* @example
|
|
*
|
|
* _.contains([1, 2, 3], 1);
|
|
* // => true
|
|
*
|
|
* _.contains([1, 2, 3], 1, 2);
|
|
* // => false
|
|
*
|
|
* _.contains({ 'name': 'moe', 'age': 40 }, 'moe');
|
|
* // => true
|
|
*
|
|
* _.contains('curly', 'ur');
|
|
* // => true
|
|
*/
|
|
function contains(collection, target) {
|
|
var indexOf = getIndexOf(),
|
|
length = collection ? collection.length : 0,
|
|
result = false;
|
|
if (length && typeof length == 'number') {
|
|
result = indexOf(collection, target) > -1;
|
|
} else {
|
|
forOwn(collection, function(value) {
|
|
return (result = value === target) && indicatorObject;
|
|
});
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates an object composed of keys generated from the results of running
|
|
* each element of `collection` through the callback. The corresponding value
|
|
* of each key is the number of times the key was returned by the callback.
|
|
* The callback is bound to `thisArg` and invoked with three arguments;
|
|
* (value, index|key, collection).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called
|
|
* per iteration. If a property name or object is provided it will be used
|
|
* to create a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Object} Returns the composed aggregate object.
|
|
* @example
|
|
*
|
|
* _.countBy([4.3, 6.1, 6.4], function(num) { return Math.floor(num); });
|
|
* // => { '4': 1, '6': 2 }
|
|
*
|
|
* _.countBy([4.3, 6.1, 6.4], function(num) { return this.floor(num); }, Math);
|
|
* // => { '4': 1, '6': 2 }
|
|
*
|
|
* _.countBy(['one', 'two', 'three'], 'length');
|
|
* // => { '3': 2, '5': 1 }
|
|
*/
|
|
var countBy = createAggregator(function(result, value, key) {
|
|
(hasOwnProperty.call(result, key) ? result[key]++ : result[key] = 1);
|
|
});
|
|
|
|
/**
|
|
* Checks if the given callback returns truthy value for **all** elements of
|
|
* a collection. The callback is bound to `thisArg` and invoked with three
|
|
* arguments; (value, index|key, collection).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias all
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called
|
|
* per iteration. If a property name or object is provided it will be used
|
|
* to create a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Boolean} Returns `true` if all elements passed the callback check,
|
|
* else `false`.
|
|
* @example
|
|
*
|
|
* _.every([true, 1, null, 'yes'], Boolean);
|
|
* // => false
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.every(stooges, 'age');
|
|
* // => true
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.every(stooges, { 'age': 50 });
|
|
* // => false
|
|
*/
|
|
function every(collection, callback, thisArg) {
|
|
var result = true;
|
|
callback = createCallback(callback, thisArg, 3);
|
|
|
|
var index = -1,
|
|
length = collection ? collection.length : 0;
|
|
|
|
if (typeof length == 'number') {
|
|
while (++index < length) {
|
|
if (!(result = !!callback(collection[index], index, collection))) {
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
forOwn(collection, function(value, index, collection) {
|
|
return !(result = !!callback(value, index, collection)) && indicatorObject;
|
|
});
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Iterates over elements of a collection, returning an array of all elements
|
|
* the callback returns truthy for. The callback is bound to `thisArg` and
|
|
* invoked with three arguments; (value, index|key, collection).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias select
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called
|
|
* per iteration. If a property name or object is provided it will be used
|
|
* to create a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a new array of elements that passed the callback check.
|
|
* @example
|
|
*
|
|
* var evens = _.filter([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
|
|
* // => [2, 4, 6]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'apple', 'organic': false, 'type': 'fruit' },
|
|
* { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.filter(food, 'organic');
|
|
* // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }]
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.filter(food, { 'type': 'fruit' });
|
|
* // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }]
|
|
*/
|
|
function filter(collection, callback, thisArg) {
|
|
var result = [];
|
|
callback = createCallback(callback, thisArg, 3);
|
|
|
|
var index = -1,
|
|
length = collection ? collection.length : 0;
|
|
|
|
if (typeof length == 'number') {
|
|
while (++index < length) {
|
|
var value = collection[index];
|
|
if (callback(value, index, collection)) {
|
|
result.push(value);
|
|
}
|
|
}
|
|
} else {
|
|
forOwn(collection, function(value, index, collection) {
|
|
if (callback(value, index, collection)) {
|
|
result.push(value);
|
|
}
|
|
});
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Iterates over elements of a collection, returning the first element that
|
|
* the callback returns truthy for. The callback is bound to `thisArg` and
|
|
* invoked with three arguments; (value, index|key, collection).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias detect, findWhere
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called
|
|
* per iteration. If a property name or object is provided it will be used
|
|
* to create a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the found element, else `undefined`.
|
|
* @example
|
|
*
|
|
* _.find([1, 2, 3, 4], function(num) {
|
|
* return num % 2 == 0;
|
|
* });
|
|
* // => 2
|
|
*
|
|
* var food = [
|
|
* { 'name': 'apple', 'organic': false, 'type': 'fruit' },
|
|
* { 'name': 'banana', 'organic': true, 'type': 'fruit' },
|
|
* { 'name': 'beet', 'organic': false, 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.find(food, { 'type': 'vegetable' });
|
|
* // => { 'name': 'beet', 'organic': false, 'type': 'vegetable' }
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.find(food, 'organic');
|
|
* // => { 'name': 'banana', 'organic': true, 'type': 'fruit' }
|
|
*/
|
|
function find(collection, callback, thisArg) {
|
|
callback = createCallback(callback, thisArg, 3);
|
|
|
|
var index = -1,
|
|
length = collection ? collection.length : 0;
|
|
|
|
if (typeof length == 'number') {
|
|
while (++index < length) {
|
|
var value = collection[index];
|
|
if (callback(value, index, collection)) {
|
|
return value;
|
|
}
|
|
}
|
|
} else {
|
|
var result;
|
|
forOwn(collection, function(value, index, collection) {
|
|
if (callback(value, index, collection)) {
|
|
result = value;
|
|
return indicatorObject;
|
|
}
|
|
});
|
|
return result;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Examines each element in a `collection`, returning the first that
|
|
* has the given `properties`. When checking `properties`, this method
|
|
* performs a deep comparison between values to determine if they are
|
|
* equivalent to each other.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Object} properties The object of property values to filter by.
|
|
* @returns {Mixed} Returns the found element, else `undefined`.
|
|
* @example
|
|
*
|
|
* var food = [
|
|
* { 'name': 'apple', 'organic': false, 'type': 'fruit' },
|
|
* { 'name': 'banana', 'organic': true, 'type': 'fruit' },
|
|
* { 'name': 'beet', 'organic': false, 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* _.findWhere(food, { 'type': 'vegetable' });
|
|
* // => { 'name': 'beet', 'organic': false, 'type': 'vegetable' }
|
|
*/
|
|
function findWhere(object, properties) {
|
|
return where(object, properties, true);
|
|
}
|
|
|
|
/**
|
|
* Iterates over elements of a collection, executing the callback for each
|
|
* element. The callback is bound to `thisArg` and invoked with three arguments;
|
|
* (value, index|key, collection). Callbacks may exit iteration early by
|
|
* explicitly returning `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias each
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function} [callback=identity] The function called per iteration.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array|Object|String} Returns `collection`.
|
|
* @example
|
|
*
|
|
* _([1, 2, 3]).forEach(function(num) { console.log(num); }).join(',');
|
|
* // => logs each number and returns '1,2,3'
|
|
*
|
|
* _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { console.log(num); });
|
|
* // => logs each number value and returns the object (order is not guaranteed)
|
|
*/
|
|
function forEach(collection, callback, thisArg) {
|
|
var index = -1,
|
|
length = collection ? collection.length : 0;
|
|
|
|
callback = callback && typeof thisArg == 'undefined' ? callback : baseCreateCallback(callback, thisArg, 3);
|
|
if (typeof length == 'number') {
|
|
while (++index < length) {
|
|
if (callback(collection[index], index, collection) === indicatorObject) {
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
forOwn(collection, callback);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This method is like `_.forEach` except that it iterates over elements
|
|
* of a `collection` from right to left.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias eachRight
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function} [callback=identity] The function called per iteration.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array|Object|String} Returns `collection`.
|
|
* @example
|
|
*
|
|
* _([1, 2, 3]).forEachRight(function(num) { console.log(num); }).join(',');
|
|
* // => logs each number from right to left and returns '3,2,1'
|
|
*/
|
|
function forEachRight(collection, callback) {
|
|
var iterable = collection,
|
|
length = collection ? collection.length : 0;
|
|
|
|
if (typeof length != 'number') {
|
|
var props = keys(collection);
|
|
length = props.length;
|
|
}
|
|
forEach(collection, function(value, index, collection) {
|
|
index = props ? props[--length] : --length;
|
|
return callback(iterable[index], index, collection) === false && indicatorObject;
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Creates an object composed of keys generated from the results of running
|
|
* each element of a collection through the callback. The corresponding value
|
|
* of each key is an array of the elements responsible for generating the key.
|
|
* The callback is bound to `thisArg` and invoked with three arguments;
|
|
* (value, index|key, collection).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called
|
|
* per iteration. If a property name or object is provided it will be used
|
|
* to create a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Object} Returns the composed aggregate object.
|
|
* @example
|
|
*
|
|
* _.groupBy([4.2, 6.1, 6.4], function(num) { return Math.floor(num); });
|
|
* // => { '4': [4.2], '6': [6.1, 6.4] }
|
|
*
|
|
* _.groupBy([4.2, 6.1, 6.4], function(num) { return this.floor(num); }, Math);
|
|
* // => { '4': [4.2], '6': [6.1, 6.4] }
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.groupBy(['one', 'two', 'three'], 'length');
|
|
* // => { '3': ['one', 'two'], '5': ['three'] }
|
|
*/
|
|
var groupBy = createAggregator(function(result, value, key) {
|
|
(hasOwnProperty.call(result, key) ? result[key] : result[key] = []).push(value);
|
|
});
|
|
|
|
/**
|
|
* Invokes the method named by `methodName` on each element in the `collection`
|
|
* returning an array of the results of each invoked method. Additional arguments
|
|
* will be provided to each invoked method. If `methodName` is a function it
|
|
* will be invoked for, and `this` bound to, each element in the `collection`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|String} methodName The name of the method to invoke or
|
|
* the function invoked per iteration.
|
|
* @param {Mixed} [arg1, arg2, ...] Arguments to invoke the method with.
|
|
* @returns {Array} Returns a new array of the results of each invoked method.
|
|
* @example
|
|
*
|
|
* _.invoke([[5, 1, 7], [3, 2, 1]], 'sort');
|
|
* // => [[1, 5, 7], [1, 2, 3]]
|
|
*
|
|
* _.invoke([123, 456], String.prototype.split, '');
|
|
* // => [['1', '2', '3'], ['4', '5', '6']]
|
|
*/
|
|
function invoke(collection, methodName) {
|
|
var args = nativeSlice.call(arguments, 2),
|
|
index = -1,
|
|
isFunc = typeof methodName == 'function',
|
|
length = collection ? collection.length : 0,
|
|
result = Array(typeof length == 'number' ? length : 0);
|
|
|
|
forEach(collection, function(value) {
|
|
result[++index] = (isFunc ? methodName : value[methodName]).apply(value, args);
|
|
});
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates an array of values by running each element in the collection
|
|
* through the callback. The callback is bound to `thisArg` and invoked with
|
|
* three arguments; (value, index|key, collection).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias collect
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called
|
|
* per iteration. If a property name or object is provided it will be used
|
|
* to create a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a new array of the results of each `callback` execution.
|
|
* @example
|
|
*
|
|
* _.map([1, 2, 3], function(num) { return num * 3; });
|
|
* // => [3, 6, 9]
|
|
*
|
|
* _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { return num * 3; });
|
|
* // => [3, 6, 9] (order is not guaranteed)
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.map(stooges, 'name');
|
|
* // => ['moe', 'larry']
|
|
*/
|
|
function map(collection, callback, thisArg) {
|
|
var index = -1,
|
|
length = collection ? collection.length : 0;
|
|
|
|
callback = createCallback(callback, thisArg, 3);
|
|
if (typeof length == 'number') {
|
|
var result = Array(length);
|
|
while (++index < length) {
|
|
result[index] = callback(collection[index], index, collection);
|
|
}
|
|
} else {
|
|
result = [];
|
|
forOwn(collection, function(value, key, collection) {
|
|
result[++index] = callback(value, key, collection);
|
|
});
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Retrieves the maximum value of an array. If a callback is provided it
|
|
* will be executed for each value in the array to generate the criterion by
|
|
* which the value is ranked. The callback is bound to `thisArg` and invoked
|
|
* with three arguments; (value, index, collection).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called
|
|
* per iteration. If a property name or object is provided it will be used
|
|
* to create a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the maximum value.
|
|
* @example
|
|
*
|
|
* _.max([4, 2, 8, 6]);
|
|
* // => 8
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* _.max(stooges, function(stooge) { return stooge.age; });
|
|
* // => { 'name': 'larry', 'age': 50 };
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.max(stooges, 'age');
|
|
* // => { 'name': 'larry', 'age': 50 };
|
|
*/
|
|
function max(collection, callback, thisArg) {
|
|
var computed = -Infinity,
|
|
result = computed;
|
|
|
|
var index = -1,
|
|
length = collection ? collection.length : 0;
|
|
|
|
if (!callback && typeof length == 'number') {
|
|
while (++index < length) {
|
|
var value = collection[index];
|
|
if (value > result) {
|
|
result = value;
|
|
}
|
|
}
|
|
} else {
|
|
callback = createCallback(callback, thisArg, 3);
|
|
|
|
forEach(collection, function(value, index, collection) {
|
|
var current = callback(value, index, collection);
|
|
if (current > computed) {
|
|
computed = current;
|
|
result = value;
|
|
}
|
|
});
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Retrieves the minimum value of an array. If a callback is provided it
|
|
* will be executed for each value in the array to generate the criterion by
|
|
* which the value is ranked. The callback is bound to `thisArg` and invoked
|
|
* with three arguments; (value, index, collection).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called
|
|
* per iteration. If a property name or object is provided it will be used
|
|
* to create a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the minimum value.
|
|
* @example
|
|
*
|
|
* _.min([4, 2, 8, 6]);
|
|
* // => 2
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* _.min(stooges, function(stooge) { return stooge.age; });
|
|
* // => { 'name': 'moe', 'age': 40 };
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.min(stooges, 'age');
|
|
* // => { 'name': 'moe', 'age': 40 };
|
|
*/
|
|
function min(collection, callback, thisArg) {
|
|
var computed = Infinity,
|
|
result = computed;
|
|
|
|
var index = -1,
|
|
length = collection ? collection.length : 0;
|
|
|
|
if (!callback && typeof length == 'number') {
|
|
while (++index < length) {
|
|
var value = collection[index];
|
|
if (value < result) {
|
|
result = value;
|
|
}
|
|
}
|
|
} else {
|
|
callback = createCallback(callback, thisArg, 3);
|
|
|
|
forEach(collection, function(value, index, collection) {
|
|
var current = callback(value, index, collection);
|
|
if (current < computed) {
|
|
computed = current;
|
|
result = value;
|
|
}
|
|
});
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Retrieves the value of a specified property from all elements in the `collection`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type Function
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {String} property The property to pluck.
|
|
* @returns {Array} Returns a new array of property values.
|
|
* @example
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* _.pluck(stooges, 'name');
|
|
* // => ['moe', 'larry']
|
|
*/
|
|
function pluck(collection, property) {
|
|
var index = -1,
|
|
length = collection ? collection.length : 0;
|
|
|
|
if (typeof length == 'number') {
|
|
var result = Array(length);
|
|
while (++index < length) {
|
|
result[index] = collection[index][property];
|
|
}
|
|
}
|
|
return result || map(collection, property);
|
|
}
|
|
|
|
/**
|
|
* Reduces a collection to a value which is the accumulated result of running
|
|
* each element in the collection through the callback, where each successive
|
|
* callback execution consumes the return value of the previous execution. If
|
|
* `accumulator` is not provided the first element of the collection will be
|
|
* used as the initial `accumulator` value. The callback is bound to `thisArg`
|
|
* and invoked with four arguments; (accumulator, value, index|key, collection).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias foldl, inject
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function} [callback=identity] The function called per iteration.
|
|
* @param {Mixed} [accumulator] Initial value of the accumulator.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the accumulated value.
|
|
* @example
|
|
*
|
|
* var sum = _.reduce([1, 2, 3], function(sum, num) {
|
|
* return sum + num;
|
|
* });
|
|
* // => 6
|
|
*
|
|
* var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) {
|
|
* result[key] = num * 3;
|
|
* return result;
|
|
* }, {});
|
|
* // => { 'a': 3, 'b': 6, 'c': 9 }
|
|
*/
|
|
function reduce(collection, callback, accumulator, thisArg) {
|
|
if (!collection) return accumulator;
|
|
var noaccum = arguments.length < 3;
|
|
callback = baseCreateCallback(callback, thisArg, 4);
|
|
|
|
var index = -1,
|
|
length = collection.length;
|
|
|
|
if (typeof length == 'number') {
|
|
if (noaccum) {
|
|
accumulator = collection[++index];
|
|
}
|
|
while (++index < length) {
|
|
accumulator = callback(accumulator, collection[index], index, collection);
|
|
}
|
|
} else {
|
|
forOwn(collection, function(value, index, collection) {
|
|
accumulator = noaccum
|
|
? (noaccum = false, value)
|
|
: callback(accumulator, value, index, collection)
|
|
});
|
|
}
|
|
return accumulator;
|
|
}
|
|
|
|
/**
|
|
* This method is like `_.reduce` except that it iterates over elements
|
|
* of a `collection` from right to left.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias foldr
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function} [callback=identity] The function called per iteration.
|
|
* @param {Mixed} [accumulator] Initial value of the accumulator.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the accumulated value.
|
|
* @example
|
|
*
|
|
* var list = [[0, 1], [2, 3], [4, 5]];
|
|
* var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []);
|
|
* // => [4, 5, 2, 3, 0, 1]
|
|
*/
|
|
function reduceRight(collection, callback, accumulator, thisArg) {
|
|
var noaccum = arguments.length < 3;
|
|
callback = baseCreateCallback(callback, thisArg, 4);
|
|
forEachRight(collection, function(value, index, collection) {
|
|
accumulator = noaccum
|
|
? (noaccum = false, value)
|
|
: callback(accumulator, value, index, collection);
|
|
});
|
|
return accumulator;
|
|
}
|
|
|
|
/**
|
|
* The opposite of `_.filter` this method returns the elements of a
|
|
* collection that the callback does **not** return truthy for.
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called
|
|
* per iteration. If a property name or object is provided it will be used
|
|
* to create a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a new array of elements that failed the callback check.
|
|
* @example
|
|
*
|
|
* var odds = _.reject([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
|
|
* // => [1, 3, 5]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'apple', 'organic': false, 'type': 'fruit' },
|
|
* { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.reject(food, 'organic');
|
|
* // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }]
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.reject(food, { 'type': 'fruit' });
|
|
* // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }]
|
|
*/
|
|
function reject(collection, callback, thisArg) {
|
|
callback = createCallback(callback, thisArg, 3);
|
|
return filter(collection, function(value, index, collection) {
|
|
return !callback(value, index, collection);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Creates an array of shuffled values, using a version of the Fisher-Yates
|
|
* shuffle. See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to shuffle.
|
|
* @returns {Array} Returns a new shuffled collection.
|
|
* @example
|
|
*
|
|
* _.shuffle([1, 2, 3, 4, 5, 6]);
|
|
* // => [4, 1, 6, 3, 5, 2]
|
|
*/
|
|
function shuffle(collection) {
|
|
var index = -1,
|
|
length = collection ? collection.length : 0,
|
|
result = Array(typeof length == 'number' ? length : 0);
|
|
|
|
forEach(collection, function(value) {
|
|
var rand = floor(nativeRandom() * (++index + 1));
|
|
result[index] = result[rand];
|
|
result[rand] = value;
|
|
});
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Gets the size of the `collection` by returning `collection.length` for arrays
|
|
* and array-like objects or the number of own enumerable properties for objects.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to inspect.
|
|
* @returns {Number} Returns `collection.length` or number of own enumerable properties.
|
|
* @example
|
|
*
|
|
* _.size([1, 2]);
|
|
* // => 2
|
|
*
|
|
* _.size({ 'one': 1, 'two': 2, 'three': 3 });
|
|
* // => 3
|
|
*
|
|
* _.size('curly');
|
|
* // => 5
|
|
*/
|
|
function size(collection) {
|
|
var length = collection ? collection.length : 0;
|
|
return typeof length == 'number' ? length : keys(collection).length;
|
|
}
|
|
|
|
/**
|
|
* Checks if the callback returns a truthy value for **any** element of a
|
|
* collection. The function returns as soon as it finds a passing value and
|
|
* does not iterate over the entire collection. The callback is bound to
|
|
* `thisArg` and invoked with three arguments; (value, index|key, collection).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias any
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called
|
|
* per iteration. If a property name or object is provided it will be used
|
|
* to create a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Boolean} Returns `true` if any element passed the callback check,
|
|
* else `false`.
|
|
* @example
|
|
*
|
|
* _.some([null, 0, 'yes', false], Boolean);
|
|
* // => true
|
|
*
|
|
* var food = [
|
|
* { 'name': 'apple', 'organic': false, 'type': 'fruit' },
|
|
* { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.some(food, 'organic');
|
|
* // => true
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.some(food, { 'type': 'meat' });
|
|
* // => false
|
|
*/
|
|
function some(collection, callback, thisArg) {
|
|
var result;
|
|
callback = createCallback(callback, thisArg, 3);
|
|
|
|
var index = -1,
|
|
length = collection ? collection.length : 0;
|
|
|
|
if (typeof length == 'number') {
|
|
while (++index < length) {
|
|
if ((result = callback(collection[index], index, collection))) {
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
forOwn(collection, function(value, index, collection) {
|
|
return (result = callback(value, index, collection)) && indicatorObject;
|
|
});
|
|
}
|
|
return !!result;
|
|
}
|
|
|
|
/**
|
|
* Creates an array of elements, sorted in ascending order by the results of
|
|
* running each element in a collection through the callback. This method
|
|
* performs a stable sort, that is, it will preserve the original sort order
|
|
* of equal elements. The callback is bound to `thisArg` and invoked with
|
|
* three arguments; (value, index|key, collection).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called
|
|
* per iteration. If a property name or object is provided it will be used
|
|
* to create a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a new array of sorted elements.
|
|
* @example
|
|
*
|
|
* _.sortBy([1, 2, 3], function(num) { return Math.sin(num); });
|
|
* // => [3, 1, 2]
|
|
*
|
|
* _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math);
|
|
* // => [3, 1, 2]
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.sortBy(['banana', 'strawberry', 'apple'], 'length');
|
|
* // => ['apple', 'banana', 'strawberry']
|
|
*/
|
|
function sortBy(collection, callback, thisArg) {
|
|
var index = -1,
|
|
length = collection ? collection.length : 0,
|
|
result = Array(typeof length == 'number' ? length : 0);
|
|
|
|
callback = createCallback(callback, thisArg, 3);
|
|
forEach(collection, function(value, key, collection) {
|
|
result[++index] = {
|
|
'criteria': callback(value, key, collection),
|
|
'index': index,
|
|
'value': value
|
|
};
|
|
});
|
|
|
|
length = result.length;
|
|
result.sort(compareAscending);
|
|
while (length--) {
|
|
result[length] = result[length].value;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Converts the `collection` to an array.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to convert.
|
|
* @returns {Array} Returns the new converted array.
|
|
* @example
|
|
*
|
|
* (function() { return _.toArray(arguments).slice(1); })(1, 2, 3, 4);
|
|
* // => [2, 3, 4]
|
|
*/
|
|
function toArray(collection) {
|
|
if (isArray(collection)) {
|
|
return nativeSlice.call(collection);
|
|
}
|
|
if (collection && typeof collection.length == 'number') {
|
|
return map(collection);
|
|
}
|
|
return values(collection);
|
|
}
|
|
|
|
/**
|
|
* Performs a deep comparison of each element in a `collection` to the given
|
|
* `properties` object, returning an array of all elements that have equivalent
|
|
* property values.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type Function
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Object} properties The object of property values to filter by.
|
|
* @returns {Array} Returns a new array of elements that have the given `properties`.
|
|
* @example
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'curly', 'age': 30, 'quotes': ['Oh, a wise guy, eh?', 'Poifect!'] },
|
|
* { 'name': 'moe', 'age': '40', 'quotes': ['Spread out!', 'You knucklehead!'] }
|
|
* ];
|
|
*
|
|
* _.where(stooges, { 'age': 40 });
|
|
* // => [{ 'name': 'moe', 'age': '40', 'quotes': ['Spread out!', 'You knucklehead!'] }]
|
|
*
|
|
* _.where(stooges, { 'quotes': ['Poifect!'] });
|
|
* // => [{ 'name': 'curly', 'age': 30, 'quotes': ['Oh, a wise guy, eh?', 'Poifect!'] }]
|
|
*/
|
|
function where(collection, properties, first) {
|
|
return (first && isEmpty(properties))
|
|
? undefined
|
|
: (first ? find : filter)(collection, properties);
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Creates an array with all falsey values removed. The values `false`, `null`,
|
|
* `0`, `""`, `undefined`, and `NaN` are all falsey.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to compact.
|
|
* @returns {Array} Returns a new array of filtered values.
|
|
* @example
|
|
*
|
|
* _.compact([0, 1, false, 2, '', 3]);
|
|
* // => [1, 2, 3]
|
|
*/
|
|
function compact(array) {
|
|
var index = -1,
|
|
length = array ? array.length : 0,
|
|
result = [];
|
|
|
|
while (++index < length) {
|
|
var value = array[index];
|
|
if (value) {
|
|
result.push(value);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates an array excluding all values of the provided arrays using strict
|
|
* equality for comparisons, i.e. `===`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to process.
|
|
* @param {Array} [array1, array2, ...] The arrays of values to exclude.
|
|
* @returns {Array} Returns a new array of filtered values.
|
|
* @example
|
|
*
|
|
* _.difference([1, 2, 3, 4, 5], [5, 2, 10]);
|
|
* // => [1, 3, 4]
|
|
*/
|
|
function difference(array) {
|
|
var index = -1,
|
|
indexOf = getIndexOf(),
|
|
length = array.length,
|
|
flattened = baseFlatten(arguments, true, true, 1),
|
|
result = [];
|
|
|
|
while (++index < length) {
|
|
var value = array[index];
|
|
if (indexOf(flattened, value) < 0) {
|
|
result.push(value);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Gets the first element of an array. If a number `n` is provided the first
|
|
* `n` elements of the array are returned. If a callback is provided elements
|
|
* at the beginning of the array are returned as long as the callback returns
|
|
* truthy. The callback is bound to `thisArg` and invoked with three arguments;
|
|
* (value, index, array).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias head, take
|
|
* @category Arrays
|
|
* @param {Array} array The array to query.
|
|
* @param {Function|Object|Number|String} [callback|n] The function called
|
|
* per element or the number of elements to return. If a property name or
|
|
* object is provided it will be used to create a "_.pluck" or "_.where"
|
|
* style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the first element(s) of `array`.
|
|
* @example
|
|
*
|
|
* _.first([1, 2, 3]);
|
|
* // => 1
|
|
*
|
|
* _.first([1, 2, 3], 2);
|
|
* // => [1, 2]
|
|
*
|
|
* _.first([1, 2, 3], function(num) {
|
|
* return num < 3;
|
|
* });
|
|
* // => [1, 2]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'banana', 'organic': true },
|
|
* { 'name': 'beet', 'organic': false },
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.first(food, 'organic');
|
|
* // => [{ 'name': 'banana', 'organic': true }]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'apple', 'type': 'fruit' },
|
|
* { 'name': 'banana', 'type': 'fruit' },
|
|
* { 'name': 'beet', 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.first(food, { 'type': 'fruit' });
|
|
* // => [{ 'name': 'apple', 'type': 'fruit' }, { 'name': 'banana', 'type': 'fruit' }]
|
|
*/
|
|
function first(array, callback, thisArg) {
|
|
if (array) {
|
|
var n = 0,
|
|
length = array.length;
|
|
|
|
if (typeof callback != 'number' && callback != null) {
|
|
var index = -1;
|
|
callback = createCallback(callback, thisArg, 3);
|
|
while (++index < length && callback(array[index], index, array)) {
|
|
n++;
|
|
}
|
|
} else {
|
|
n = callback;
|
|
if (n == null || thisArg) {
|
|
return array[0];
|
|
}
|
|
}
|
|
return nativeSlice.call(array, 0, nativeMin(nativeMax(0, n), length));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Flattens a nested array (the nesting can be to any depth). If `isShallow`
|
|
* is truthy, the array will only be flattened a single level. If a callback
|
|
* is provided each element of the array is passed through the callback before
|
|
* flattening. The callback is bound to `thisArg` and invoked with three
|
|
* arguments; (value, index, array).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to flatten.
|
|
* @param {Boolean} [isShallow=false] A flag to restrict flattening to a single level.
|
|
* @param {Function|Object|String} [callback=identity] The function called
|
|
* per iteration. If a property name or object is provided it will be used
|
|
* to create a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a new flattened array.
|
|
* @example
|
|
*
|
|
* _.flatten([1, [2], [3, [[4]]]]);
|
|
* // => [1, 2, 3, 4];
|
|
*
|
|
* _.flatten([1, [2], [3, [[4]]]], true);
|
|
* // => [1, 2, 3, [[4]]];
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'curly', 'quotes': ['Oh, a wise guy, eh?', 'Poifect!'] },
|
|
* { 'name': 'moe', 'quotes': ['Spread out!', 'You knucklehead!'] }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.flatten(stooges, 'quotes');
|
|
* // => ['Oh, a wise guy, eh?', 'Poifect!', 'Spread out!', 'You knucklehead!']
|
|
*/
|
|
function flatten(array, isShallow) {
|
|
return baseFlatten(array, isShallow);
|
|
}
|
|
|
|
/**
|
|
* Gets the index at which the first occurrence of `value` is found using
|
|
* strict equality for comparisons, i.e. `===`. If the array is already sorted
|
|
* providing `true` for `fromIndex` will run a faster binary search.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to search.
|
|
* @param {Mixed} value The value to search for.
|
|
* @param {Boolean|Number} [fromIndex=0] The index to search from or `true`
|
|
* to perform a binary search on a sorted array.
|
|
* @returns {Number} Returns the index of the matched value or `-1`.
|
|
* @example
|
|
*
|
|
* _.indexOf([1, 2, 3, 1, 2, 3], 2);
|
|
* // => 1
|
|
*
|
|
* _.indexOf([1, 2, 3, 1, 2, 3], 2, 3);
|
|
* // => 4
|
|
*
|
|
* _.indexOf([1, 1, 2, 2, 3, 3], 2, true);
|
|
* // => 2
|
|
*/
|
|
function indexOf(array, value, fromIndex) {
|
|
if (typeof fromIndex == 'number') {
|
|
var length = array ? array.length : 0;
|
|
fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex || 0);
|
|
} else if (fromIndex) {
|
|
var index = sortedIndex(array, value);
|
|
return array[index] === value ? index : -1;
|
|
}
|
|
return array ? baseIndexOf(array, value, fromIndex) : -1;
|
|
}
|
|
|
|
/**
|
|
* Gets all but the last element of an array. If a number `n` is provided
|
|
* the last `n` elements are excluded from the result. If a callback is
|
|
* provided elements at the end of the array are excluded from the result
|
|
* as long as the callback returns truthy. The callback is bound to `thisArg`
|
|
* and invoked with three arguments; (value, index, array).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to query.
|
|
* @param {Function|Object|Number|String} [callback|n=1] The function called
|
|
* per element or the number of elements to exclude. If a property name or
|
|
* object is provided it will be used to create a "_.pluck" or "_.where"
|
|
* style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a slice of `array`.
|
|
* @example
|
|
*
|
|
* _.initial([1, 2, 3]);
|
|
* // => [1, 2]
|
|
*
|
|
* _.initial([1, 2, 3], 2);
|
|
* // => [1]
|
|
*
|
|
* _.initial([1, 2, 3], function(num) {
|
|
* return num > 1;
|
|
* });
|
|
* // => [1]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'beet', 'organic': false },
|
|
* { 'name': 'carrot', 'organic': true }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.initial(food, 'organic');
|
|
* // => [{ 'name': 'beet', 'organic': false }]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'banana', 'type': 'fruit' },
|
|
* { 'name': 'beet', 'type': 'vegetable' },
|
|
* { 'name': 'carrot', 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.initial(food, { 'type': 'vegetable' });
|
|
* // => [{ 'name': 'banana', 'type': 'fruit' }]
|
|
*/
|
|
function initial(array, callback, thisArg) {
|
|
if (!array) {
|
|
return [];
|
|
}
|
|
var n = 0,
|
|
length = array.length;
|
|
|
|
if (typeof callback != 'number' && callback != null) {
|
|
var index = length;
|
|
callback = createCallback(callback, thisArg, 3);
|
|
while (index-- && callback(array[index], index, array)) {
|
|
n++;
|
|
}
|
|
} else {
|
|
n = (callback == null || thisArg) ? 1 : callback || n;
|
|
}
|
|
return nativeSlice.call(array, 0, nativeMin(nativeMax(0, length - n), length));
|
|
}
|
|
|
|
/**
|
|
* Creates an array of unique values present in all provided arrays using
|
|
* strict equality for comparisons, i.e. `===`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} [array1, array2, ...] The arrays to inspect.
|
|
* @returns {Array} Returns an array of composite values.
|
|
* @example
|
|
*
|
|
* _.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]);
|
|
* // => [1, 2]
|
|
*/
|
|
function intersection(array) {
|
|
var args = arguments,
|
|
argsLength = args.length,
|
|
index = -1,
|
|
indexOf = getIndexOf(),
|
|
length = array ? array.length : 0,
|
|
result = [];
|
|
|
|
outer:
|
|
while (++index < length) {
|
|
var value = array[index];
|
|
if (indexOf(result, value) < 0) {
|
|
var argsIndex = argsLength;
|
|
while (--argsIndex) {
|
|
if (indexOf(args[argsIndex], value) < 0) {
|
|
continue outer;
|
|
}
|
|
}
|
|
result.push(value);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Gets the last element of an array. If a number `n` is provided the last
|
|
* `n` elements of the array are returned. If a callback is provided elements
|
|
* at the end of the array are returned as long as the callback returns truthy.
|
|
* The callback is bound to `thisArg` and invoked with three arguments;
|
|
* (value, index, array).
|
|
*
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to query.
|
|
* @param {Function|Object|Number|String} [callback|n] The function called
|
|
* per element or the number of elements to return. If a property name or
|
|
* object is provided it will be used to create a "_.pluck" or "_.where"
|
|
* style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the last element(s) of `array`.
|
|
* @example
|
|
*
|
|
* _.last([1, 2, 3]);
|
|
* // => 3
|
|
*
|
|
* _.last([1, 2, 3], 2);
|
|
* // => [2, 3]
|
|
*
|
|
* _.last([1, 2, 3], function(num) {
|
|
* return num > 1;
|
|
* });
|
|
* // => [2, 3]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'beet', 'organic': false },
|
|
* { 'name': 'carrot', 'organic': true }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.last(food, 'organic');
|
|
* // => [{ 'name': 'carrot', 'organic': true }]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'banana', 'type': 'fruit' },
|
|
* { 'name': 'beet', 'type': 'vegetable' },
|
|
* { 'name': 'carrot', 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.last(food, { 'type': 'vegetable' });
|
|
* // => [{ 'name': 'beet', 'type': 'vegetable' }, { 'name': 'carrot', 'type': 'vegetable' }]
|
|
*/
|
|
function last(array, callback, thisArg) {
|
|
if (array) {
|
|
var n = 0,
|
|
length = array.length;
|
|
|
|
if (typeof callback != 'number' && callback != null) {
|
|
var index = length;
|
|
callback = createCallback(callback, thisArg, 3);
|
|
while (index-- && callback(array[index], index, array)) {
|
|
n++;
|
|
}
|
|
} else {
|
|
n = callback;
|
|
if (n == null || thisArg) {
|
|
return array[length - 1];
|
|
}
|
|
}
|
|
return nativeSlice.call(array, nativeMax(0, length - n));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets the index at which the last occurrence of `value` is found using strict
|
|
* equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used
|
|
* as the offset from the end of the collection.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to search.
|
|
* @param {Mixed} value The value to search for.
|
|
* @param {Number} [fromIndex=array.length-1] The index to search from.
|
|
* @returns {Number} Returns the index of the matched value or `-1`.
|
|
* @example
|
|
*
|
|
* _.lastIndexOf([1, 2, 3, 1, 2, 3], 2);
|
|
* // => 4
|
|
*
|
|
* _.lastIndexOf([1, 2, 3, 1, 2, 3], 2, 3);
|
|
* // => 1
|
|
*/
|
|
function lastIndexOf(array, value, fromIndex) {
|
|
var index = array ? array.length : 0;
|
|
if (typeof fromIndex == 'number') {
|
|
index = (fromIndex < 0 ? nativeMax(0, index + fromIndex) : nativeMin(fromIndex, index - 1)) + 1;
|
|
}
|
|
while (index--) {
|
|
if (array[index] === value) {
|
|
return index;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* Creates an array of numbers (positive and/or negative) progressing from
|
|
* `start` up to but not including `end`. If `start` is less than `stop` a
|
|
* zero-length range is created unless a negative `step` is specified.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Number} [start=0] The start of the range.
|
|
* @param {Number} end The end of the range.
|
|
* @param {Number} [step=1] The value to increment or decrement by.
|
|
* @returns {Array} Returns a new range array.
|
|
* @example
|
|
*
|
|
* _.range(10);
|
|
* // => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
|
|
*
|
|
* _.range(1, 11);
|
|
* // => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
|
|
*
|
|
* _.range(0, 30, 5);
|
|
* // => [0, 5, 10, 15, 20, 25]
|
|
*
|
|
* _.range(0, -10, -1);
|
|
* // => [0, -1, -2, -3, -4, -5, -6, -7, -8, -9]
|
|
*
|
|
* _.range(1, 4, 0);
|
|
* // => [1, 1, 1]
|
|
*
|
|
* _.range(0);
|
|
* // => []
|
|
*/
|
|
function range(start, end, step) {
|
|
start = +start || 0;
|
|
step = (+step || 1);
|
|
|
|
if (end == null) {
|
|
end = start;
|
|
start = 0;
|
|
}
|
|
// use `Array(length)` so engines, like Chakra and V8, avoid slower modes
|
|
// http://youtu.be/XAqIpGU8ZZk#t=17m25s
|
|
var index = -1,
|
|
length = nativeMax(0, ceil((end - start) / step)),
|
|
result = Array(length);
|
|
|
|
while (++index < length) {
|
|
result[index] = start;
|
|
start += step;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* The opposite of `_.initial` this method gets all but the first value of
|
|
* an array. If a number `n` is provided the first `n` values are excluded
|
|
* from the result. If a callback function is provided elements at the beginning
|
|
* of the array are excluded from the result as long as the callback returns
|
|
* truthy. The callback is bound to `thisArg` and invoked with three
|
|
* arguments; (value, index, array).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias drop, tail
|
|
* @category Arrays
|
|
* @param {Array} array The array to query.
|
|
* @param {Function|Object|Number|String} [callback|n=1] The function called
|
|
* per element or the number of elements to exclude. If a property name or
|
|
* object is provided it will be used to create a "_.pluck" or "_.where"
|
|
* style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a slice of `array`.
|
|
* @example
|
|
*
|
|
* _.rest([1, 2, 3]);
|
|
* // => [2, 3]
|
|
*
|
|
* _.rest([1, 2, 3], 2);
|
|
* // => [3]
|
|
*
|
|
* _.rest([1, 2, 3], function(num) {
|
|
* return num < 3;
|
|
* });
|
|
* // => [3]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'banana', 'organic': true },
|
|
* { 'name': 'beet', 'organic': false },
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.rest(food, 'organic');
|
|
* // => [{ 'name': 'beet', 'organic': false }]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'apple', 'type': 'fruit' },
|
|
* { 'name': 'banana', 'type': 'fruit' },
|
|
* { 'name': 'beet', 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.rest(food, { 'type': 'fruit' });
|
|
* // => [{ 'name': 'beet', 'type': 'vegetable' }]
|
|
*/
|
|
function rest(array, callback, thisArg) {
|
|
if (typeof callback != 'number' && callback != null) {
|
|
var n = 0,
|
|
index = -1,
|
|
length = array ? array.length : 0;
|
|
|
|
callback = createCallback(callback, thisArg, 3);
|
|
while (++index < length && callback(array[index], index, array)) {
|
|
n++;
|
|
}
|
|
} else {
|
|
n = (callback == null || thisArg) ? 1 : nativeMax(0, callback);
|
|
}
|
|
return nativeSlice.call(array, n);
|
|
}
|
|
|
|
/**
|
|
* Uses a binary search to determine the smallest index at which a value
|
|
* should be inserted into a given sorted array in order to maintain the sort
|
|
* order of the array. If a callback is provided it will be executed for
|
|
* `value` and each element of `array` to compute their sort ranking. The
|
|
* callback is bound to `thisArg` and invoked with one argument; (value).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to inspect.
|
|
* @param {Mixed} value The value to evaluate.
|
|
* @param {Function|Object|String} [callback=identity] The function called
|
|
* per iteration. If a property name or object is provided it will be used
|
|
* to create a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Number} Returns the index at which `value` should be inserted
|
|
* into `array`.
|
|
* @example
|
|
*
|
|
* _.sortedIndex([20, 30, 50], 40);
|
|
* // => 2
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.sortedIndex([{ 'x': 20 }, { 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x');
|
|
* // => 2
|
|
*
|
|
* var dict = {
|
|
* 'wordToNumber': { 'twenty': 20, 'thirty': 30, 'fourty': 40, 'fifty': 50 }
|
|
* };
|
|
*
|
|
* _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) {
|
|
* return dict.wordToNumber[word];
|
|
* });
|
|
* // => 2
|
|
*
|
|
* _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) {
|
|
* return this.wordToNumber[word];
|
|
* }, dict);
|
|
* // => 2
|
|
*/
|
|
function sortedIndex(array, value, callback, thisArg) {
|
|
var low = 0,
|
|
high = array ? array.length : low;
|
|
|
|
// explicitly reference `identity` for better inlining in Firefox
|
|
callback = callback ? createCallback(callback, thisArg, 1) : identity;
|
|
value = callback(value);
|
|
|
|
while (low < high) {
|
|
var mid = (low + high) >>> 1;
|
|
(callback(array[mid]) < value)
|
|
? low = mid + 1
|
|
: high = mid;
|
|
}
|
|
return low;
|
|
}
|
|
|
|
/**
|
|
* Creates an array of unique values, in order, of the provided arrays using
|
|
* strict equality for comparisons, i.e. `===`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} [array1, array2, ...] The arrays to inspect.
|
|
* @returns {Array} Returns an array of composite values.
|
|
* @example
|
|
*
|
|
* _.union([1, 2, 3], [101, 2, 1, 10], [2, 1]);
|
|
* // => [1, 2, 3, 101, 10]
|
|
*/
|
|
function union(array) {
|
|
return baseUniq(baseFlatten(arguments, true, true));
|
|
}
|
|
|
|
/**
|
|
* Creates a duplicate-value-free version of an array using strict equality
|
|
* for comparisons, i.e. `===`. If the array is sorted, providing
|
|
* `true` for `isSorted` will use a faster algorithm. If a callback is provided
|
|
* each element of `array` is passed through the callback before uniqueness
|
|
* is computed. The callback is bound to `thisArg` and invoked with three
|
|
* arguments; (value, index, array).
|
|
*
|
|
* If a property name is provided for `callback` the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is provided for `callback` the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias unique
|
|
* @category Arrays
|
|
* @param {Array} array The array to process.
|
|
* @param {Boolean} [isSorted=false] A flag to indicate that `array` is sorted.
|
|
* @param {Function|Object|String} [callback=identity] The function called
|
|
* per iteration. If a property name or object is provided it will be used
|
|
* to create a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a duplicate-value-free array.
|
|
* @example
|
|
*
|
|
* _.uniq([1, 2, 1, 3, 1]);
|
|
* // => [1, 2, 3]
|
|
*
|
|
* _.uniq([1, 1, 2, 2, 3], true);
|
|
* // => [1, 2, 3]
|
|
*
|
|
* _.uniq(['A', 'b', 'C', 'a', 'B', 'c'], function(letter) { return letter.toLowerCase(); });
|
|
* // => ['A', 'b', 'C']
|
|
*
|
|
* _.uniq([1, 2.5, 3, 1.5, 2, 3.5], function(num) { return this.floor(num); }, Math);
|
|
* // => [1, 2.5, 3]
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
|
|
* // => [{ 'x': 1 }, { 'x': 2 }]
|
|
*/
|
|
function uniq(array, isSorted, callback, thisArg) {
|
|
// juggle arguments
|
|
if (typeof isSorted != 'boolean' && isSorted != null) {
|
|
thisArg = callback;
|
|
callback = !(thisArg && thisArg[isSorted] === array) ? isSorted : undefined;
|
|
isSorted = false;
|
|
}
|
|
if (callback != null) {
|
|
callback = createCallback(callback, thisArg, 3);
|
|
}
|
|
return baseUniq(array, isSorted, callback);
|
|
}
|
|
|
|
/**
|
|
* Creates an array excluding all provided values using strict equality for
|
|
* comparisons, i.e. `===`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to filter.
|
|
* @param {Mixed} [value1, value2, ...] The values to exclude.
|
|
* @returns {Array} Returns a new array of filtered values.
|
|
* @example
|
|
*
|
|
* _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
|
|
* // => [2, 3, 4]
|
|
*/
|
|
function without(array) {
|
|
return difference(array, nativeSlice.call(arguments, 1));
|
|
}
|
|
|
|
/**
|
|
* Creates an array of grouped elements, the first of which contains the first
|
|
* elements of the given arrays, the second of which contains the second
|
|
* elements of the given arrays, and so on.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias unzip
|
|
* @category Arrays
|
|
* @param {Array} [array1, array2, ...] Arrays to process.
|
|
* @returns {Array} Returns a new array of grouped elements.
|
|
* @example
|
|
*
|
|
* _.zip(['moe', 'larry'], [30, 40], [true, false]);
|
|
* // => [['moe', 30, true], ['larry', 40, false]]
|
|
*/
|
|
function zip() {
|
|
var index = -1,
|
|
length = max(pluck(arguments, 'length')),
|
|
result = Array(length < 0 ? 0 : length);
|
|
|
|
while (++index < length) {
|
|
result[index] = pluck(arguments, index);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates an object composed from arrays of `keys` and `values`. Provide
|
|
* either a single two dimensional array, i.e. `[[key1, value1], [key2, value2]]`
|
|
* or two arrays, one of `keys` and one of corresponding `values`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias object
|
|
* @category Arrays
|
|
* @param {Array} keys The array of keys.
|
|
* @param {Array} [values=[]] The array of values.
|
|
* @returns {Object} Returns an object composed of the given keys and
|
|
* corresponding values.
|
|
* @example
|
|
*
|
|
* _.zipObject(['moe', 'larry'], [30, 40]);
|
|
* // => { 'moe': 30, 'larry': 40 }
|
|
*/
|
|
function zipObject(keys, values) {
|
|
var index = -1,
|
|
length = keys ? keys.length : 0,
|
|
result = {};
|
|
|
|
while (++index < length) {
|
|
var key = keys[index];
|
|
if (values) {
|
|
result[key] = values[index];
|
|
} else if (key) {
|
|
result[key[0]] = key[1];
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Creates a function this is restricted to executing `func` with the `this`
|
|
* binding and arguments of the created function, only after it is called `n` times.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Number} n The number of times the function must be called before
|
|
* `func` is executed.
|
|
* @param {Function} func The function to restrict.
|
|
* @returns {Function} Returns the new restricted function.
|
|
* @example
|
|
*
|
|
* var renderNotes = _.after(notes.length, render);
|
|
* _.forEach(notes, function(note) {
|
|
* note.asyncSave({ 'success': renderNotes });
|
|
* });
|
|
* // `renderNotes` is run once, after all notes have saved
|
|
*/
|
|
function after(n, func) {
|
|
if (!isFunction(func)) {
|
|
throw new TypeError;
|
|
}
|
|
return function() {
|
|
if (--n < 1) {
|
|
return func.apply(this, arguments);
|
|
}
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Creates a function that, when called, invokes `func` with the `this`
|
|
* binding of `thisArg` and prepends any additional `bind` arguments to those
|
|
* provided to the bound function.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to bind.
|
|
* @param {Mixed} [thisArg] The `this` binding of `func`.
|
|
* @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.
|
|
* @returns {Function} Returns the new bound function.
|
|
* @example
|
|
*
|
|
* var func = function(greeting) {
|
|
* return greeting + ' ' + this.name;
|
|
* };
|
|
*
|
|
* func = _.bind(func, { 'name': 'moe' }, 'hi');
|
|
* func();
|
|
* // => 'hi moe'
|
|
*/
|
|
function bind(func, thisArg) {
|
|
return createBound(func, 17, nativeSlice.call(arguments, 2), null, thisArg);
|
|
}
|
|
|
|
/**
|
|
* Binds methods of an object to the object itself, overwriting the existing
|
|
* method. Method names may be specified as individual arguments or as arrays
|
|
* of method names. If no method names are provided all the function properties
|
|
* of `object` will be bound.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Object} object The object to bind and assign the bound methods to.
|
|
* @param {String} [methodName1, methodName2, ...] The object method names to
|
|
* bind, specified as individual method names or arrays of method names.
|
|
* @returns {Object} Returns `object`.
|
|
* @example
|
|
*
|
|
* var view = {
|
|
* 'label': 'docs',
|
|
* 'onClick': function() { console.log('clicked ' + this.label); }
|
|
* };
|
|
*
|
|
* _.bindAll(view);
|
|
* jQuery('#docs').on('click', view.onClick);
|
|
* // => logs 'clicked docs', when the button is clicked
|
|
*/
|
|
function bindAll(object) {
|
|
var funcs = arguments.length > 1 ? baseFlatten(arguments, true, false, 1) : functions(object),
|
|
index = -1,
|
|
length = funcs.length;
|
|
|
|
while (++index < length) {
|
|
var key = funcs[index];
|
|
object[key] = bind(object[key], object);
|
|
}
|
|
return object;
|
|
}
|
|
|
|
/**
|
|
* Creates a function that is the composition of the provided functions,
|
|
* where each function consumes the return value of the function that follows.
|
|
* For example, composing the functions `f()`, `g()`, and `h()` produces `f(g(h()))`.
|
|
* Each function is executed with the `this` binding of the composed function.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} [func1, func2, ...] Functions to compose.
|
|
* @returns {Function} Returns the new composed function.
|
|
* @example
|
|
*
|
|
* var realNameMap = {
|
|
* 'curly': 'jerome'
|
|
* };
|
|
*
|
|
* var format = function(name) {
|
|
* name = realNameMap[name.toLowerCase()] || name;
|
|
* return name.charAt(0).toUpperCase() + name.slice(1).toLowerCase();
|
|
* };
|
|
*
|
|
* var greet = function(formatted) {
|
|
* return 'Hiya ' + formatted + '!';
|
|
* };
|
|
*
|
|
* var welcome = _.compose(greet, format);
|
|
* welcome('curly');
|
|
* // => 'Hiya Jerome!'
|
|
*/
|
|
function compose() {
|
|
var funcs = arguments,
|
|
length = funcs.length || 1;
|
|
|
|
while (length--) {
|
|
if (!isFunction(funcs[length])) {
|
|
throw new TypeError;
|
|
}
|
|
}
|
|
return function() {
|
|
var args = arguments,
|
|
length = funcs.length;
|
|
|
|
while (length--) {
|
|
args = [funcs[length].apply(this, args)];
|
|
}
|
|
return args[0];
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Produces a callback bound to an optional `thisArg`. If `func` is a property
|
|
* name the created callback will return the property value for a given element.
|
|
* If `func` is an object the created callback will return `true` for elements
|
|
* that contain the equivalent object properties, otherwise it will return `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Mixed} [func=identity] The value to convert to a callback.
|
|
* @param {Mixed} [thisArg] The `this` binding of the created callback.
|
|
* @param {Number} [argCount] The number of arguments the callback accepts.
|
|
* @returns {Function} Returns a callback function.
|
|
* @example
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* // wrap to create custom callback shorthands
|
|
* _.createCallback = _.wrap(_.createCallback, function(func, callback, thisArg) {
|
|
* var match = /^(.+?)__([gl]t)(.+)$/.exec(callback);
|
|
* return !match ? func(callback, thisArg) : function(object) {
|
|
* return match[2] == 'gt' ? object[match[1]] > match[3] : object[match[1]] < match[3];
|
|
* };
|
|
* });
|
|
*
|
|
* _.filter(stooges, 'age__gt45');
|
|
* // => [{ 'name': 'larry', 'age': 50 }]
|
|
*/
|
|
function createCallback(func, thisArg, argCount) {
|
|
var type = typeof func;
|
|
if (func == null || type == 'function') {
|
|
return baseCreateCallback(func, thisArg, argCount);
|
|
}
|
|
// handle "_.pluck" style callback shorthands
|
|
if (type != 'object') {
|
|
return function(object) {
|
|
return object[func];
|
|
};
|
|
}
|
|
var props = keys(func);
|
|
return function(object) {
|
|
var length = props.length,
|
|
result = false;
|
|
|
|
while (length--) {
|
|
if (!(result = object[props[length]] === func[props[length]])) {
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Creates a function that will delay the execution of `func` until after
|
|
* `wait` milliseconds have elapsed since the last time it was invoked.
|
|
* Provide an options object to indicate that `func` should be invoked on
|
|
* the leading and/or trailing edge of the `wait` timeout. Subsequent calls
|
|
* to the debounced function will return the result of the last `func` call.
|
|
*
|
|
* Note: If `leading` and `trailing` options are `true` `func` will be called
|
|
* on the trailing edge of the timeout only if the the debounced function is
|
|
* invoked more than once during the `wait` timeout.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to debounce.
|
|
* @param {Number} wait The number of milliseconds to delay.
|
|
* @param {Object} options The options object.
|
|
* [leading=false] A boolean to specify execution on the leading edge of the timeout.
|
|
* [maxWait] The maximum time `func` is allowed to be delayed before it's called.
|
|
* [trailing=true] A boolean to specify execution on the trailing edge of the timeout.
|
|
* @returns {Function} Returns the new debounced function.
|
|
* @example
|
|
*
|
|
* // avoid costly calculations while the window size is in flux
|
|
* var lazyLayout = _.debounce(calculateLayout, 150);
|
|
* jQuery(window).on('resize', lazyLayout);
|
|
*
|
|
* // execute `sendMail` when the click event is fired, debouncing subsequent calls
|
|
* jQuery('#postbox').on('click', _.debounce(sendMail, 300, {
|
|
* 'leading': true,
|
|
* 'trailing': false
|
|
* });
|
|
*
|
|
* // ensure `batchLog` is executed once after 1 second of debounced calls
|
|
* var source = new EventSource('/stream');
|
|
* source.addEventListener('message', _.debounce(batchLog, 250, {
|
|
* 'maxWait': 1000
|
|
* }, false);
|
|
*/
|
|
function debounce(func, wait, options) {
|
|
var args,
|
|
result,
|
|
thisArg,
|
|
callCount = 0,
|
|
lastCalled = 0,
|
|
maxWait = false,
|
|
maxTimeoutId = null,
|
|
timeoutId = null,
|
|
trailing = true;
|
|
|
|
if (!isFunction(func)) {
|
|
throw new TypeError;
|
|
}
|
|
wait = nativeMax(0, wait || 0);
|
|
if (options === true) {
|
|
var leading = true;
|
|
trailing = false;
|
|
} else if (isObject(options)) {
|
|
leading = options.leading;
|
|
maxWait = 'maxWait' in options && nativeMax(wait, options.maxWait || 0);
|
|
trailing = 'trailing' in options ? options.trailing : trailing;
|
|
}
|
|
var clear = function() {
|
|
clearTimeout(maxTimeoutId);
|
|
clearTimeout(timeoutId);
|
|
callCount = 0;
|
|
maxTimeoutId = timeoutId = null;
|
|
};
|
|
|
|
var delayed = function() {
|
|
var isCalled = trailing && (!leading || callCount > 1);
|
|
clear();
|
|
if (isCalled) {
|
|
if (maxWait !== false) {
|
|
lastCalled = +new Date;
|
|
}
|
|
result = func.apply(thisArg, args);
|
|
}
|
|
};
|
|
|
|
var maxDelayed = function() {
|
|
clear();
|
|
if (trailing || (maxWait !== wait)) {
|
|
lastCalled = +new Date;
|
|
result = func.apply(thisArg, args);
|
|
}
|
|
};
|
|
|
|
return function() {
|
|
args = arguments;
|
|
thisArg = this;
|
|
callCount++;
|
|
|
|
// avoid issues with Titanium and `undefined` timeout ids
|
|
// https://github.com/appcelerator/titanium_mobile/blob/3_1_0_GA/android/titanium/src/java/ti/modules/titanium/TitaniumModule.java#L185-L192
|
|
clearTimeout(timeoutId);
|
|
|
|
if (maxWait === false) {
|
|
if (leading && callCount < 2) {
|
|
result = func.apply(thisArg, args);
|
|
}
|
|
} else {
|
|
var stamp = +new Date;
|
|
if (!maxTimeoutId && !leading) {
|
|
lastCalled = stamp;
|
|
}
|
|
var remaining = maxWait - (stamp - lastCalled);
|
|
if (remaining <= 0) {
|
|
clearTimeout(maxTimeoutId);
|
|
maxTimeoutId = null;
|
|
lastCalled = stamp;
|
|
result = func.apply(thisArg, args);
|
|
}
|
|
else if (!maxTimeoutId) {
|
|
maxTimeoutId = setTimeout(maxDelayed, remaining);
|
|
}
|
|
}
|
|
if (wait !== maxWait) {
|
|
timeoutId = setTimeout(delayed, wait);
|
|
}
|
|
return result;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Defers executing the `func` function until the current call stack has cleared.
|
|
* Additional arguments will be provided to `func` when it is invoked.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to defer.
|
|
* @param {Mixed} [arg1, arg2, ...] Arguments to invoke the function with.
|
|
* @returns {Number} Returns the timer id.
|
|
* @example
|
|
*
|
|
* _.defer(function() { console.log('deferred'); });
|
|
* // returns from the function before 'deferred' is logged
|
|
*/
|
|
function defer(func) {
|
|
if (!isFunction(func)) {
|
|
throw new TypeError;
|
|
}
|
|
var args = nativeSlice.call(arguments, 1);
|
|
return setTimeout(function() { func.apply(undefined, args); }, 1);
|
|
}
|
|
|
|
/**
|
|
* Executes the `func` function after `wait` milliseconds. Additional arguments
|
|
* will be provided to `func` when it is invoked.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to delay.
|
|
* @param {Number} wait The number of milliseconds to delay execution.
|
|
* @param {Mixed} [arg1, arg2, ...] Arguments to invoke the function with.
|
|
* @returns {Number} Returns the timer id.
|
|
* @example
|
|
*
|
|
* var log = _.bind(console.log, console);
|
|
* _.delay(log, 1000, 'logged later');
|
|
* // => 'logged later' (Appears after one second.)
|
|
*/
|
|
function delay(func, wait) {
|
|
if (!isFunction(func)) {
|
|
throw new TypeError;
|
|
}
|
|
var args = nativeSlice.call(arguments, 2);
|
|
return setTimeout(function() { func.apply(undefined, args); }, wait);
|
|
}
|
|
|
|
/**
|
|
* Creates a function that memoizes the result of `func`. If `resolver` is
|
|
* provided it will be used to determine the cache key for storing the result
|
|
* based on the arguments provided to the memoized function. By default, the
|
|
* first argument provided to the memoized function is used as the cache key.
|
|
* The `func` is executed with the `this` binding of the memoized function.
|
|
* The result cache is exposed as the `cache` property on the memoized function.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to have its output memoized.
|
|
* @param {Function} [resolver] A function used to resolve the cache key.
|
|
* @returns {Function} Returns the new memoizing function.
|
|
* @example
|
|
*
|
|
* var fibonacci = _.memoize(function(n) {
|
|
* return n < 2 ? n : fibonacci(n - 1) + fibonacci(n - 2);
|
|
* });
|
|
*/
|
|
function memoize(func, resolver) {
|
|
var cache = {};
|
|
return function() {
|
|
var key = keyPrefix + (resolver ? resolver.apply(this, arguments) : arguments[0]);
|
|
return hasOwnProperty.call(cache, key)
|
|
? cache[key]
|
|
: (cache[key] = func.apply(this, arguments));
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Creates a function that is restricted to execute `func` once. Repeat calls to
|
|
* the function will return the value of the first call. The `func` is executed
|
|
* with the `this` binding of the created function.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to restrict.
|
|
* @returns {Function} Returns the new restricted function.
|
|
* @example
|
|
*
|
|
* var initialize = _.once(createApplication);
|
|
* initialize();
|
|
* initialize();
|
|
* // `initialize` executes `createApplication` once
|
|
*/
|
|
function once(func) {
|
|
var ran,
|
|
result;
|
|
|
|
if (!isFunction(func)) {
|
|
throw new TypeError;
|
|
}
|
|
return function() {
|
|
if (ran) {
|
|
return result;
|
|
}
|
|
ran = true;
|
|
result = func.apply(this, arguments);
|
|
|
|
// clear the `func` variable so the function may be garbage collected
|
|
func = null;
|
|
return result;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Creates a function that, when called, invokes `func` with any additional
|
|
* `partial` arguments prepended to those provided to the new function. This
|
|
* method is similar to `_.bind` except it does **not** alter the `this` binding.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to partially apply arguments to.
|
|
* @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.
|
|
* @returns {Function} Returns the new partially applied function.
|
|
* @example
|
|
*
|
|
* var greet = function(greeting, name) { return greeting + ' ' + name; };
|
|
* var hi = _.partial(greet, 'hi');
|
|
* hi('moe');
|
|
* // => 'hi moe'
|
|
*/
|
|
function partial(func) {
|
|
return createBound(func, 16, nativeSlice.call(arguments, 1));
|
|
}
|
|
|
|
/**
|
|
* Creates a function that, when executed, will only call the `func` function
|
|
* at most once per every `wait` milliseconds. Provide an options object to
|
|
* indicate that `func` should be invoked on the leading and/or trailing edge
|
|
* of the `wait` timeout. Subsequent calls to the throttled function will
|
|
* return the result of the last `func` call.
|
|
*
|
|
* Note: If `leading` and `trailing` options are `true` `func` will be called
|
|
* on the trailing edge of the timeout only if the the throttled function is
|
|
* invoked more than once during the `wait` timeout.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to throttle.
|
|
* @param {Number} wait The number of milliseconds to throttle executions to.
|
|
* @param {Object} options The options object.
|
|
* [leading=true] A boolean to specify execution on the leading edge of the timeout.
|
|
* [trailing=true] A boolean to specify execution on the trailing edge of the timeout.
|
|
* @returns {Function} Returns the new throttled function.
|
|
* @example
|
|
*
|
|
* // avoid excessively updating the position while scrolling
|
|
* var throttled = _.throttle(updatePosition, 100);
|
|
* jQuery(window).on('scroll', throttled);
|
|
*
|
|
* // execute `renewToken` when the click event is fired, but not more than once every 5 minutes
|
|
* jQuery('.interactive').on('click', _.throttle(renewToken, 300000, {
|
|
* 'trailing': false
|
|
* }));
|
|
*/
|
|
function throttle(func, wait, options) {
|
|
var leading = true,
|
|
trailing = true;
|
|
|
|
if (options === false) {
|
|
leading = false;
|
|
} else if (isObject(options)) {
|
|
leading = 'leading' in options ? options.leading : leading;
|
|
trailing = 'trailing' in options ? options.trailing : trailing;
|
|
}
|
|
options = {};
|
|
options.leading = leading;
|
|
options.maxWait = wait;
|
|
options.trailing = trailing;
|
|
|
|
return debounce(func, wait, options);
|
|
}
|
|
|
|
/**
|
|
* Creates a function that provides `value` to the wrapper function as its
|
|
* first argument. Additional arguments provided to the function are appended
|
|
* to those provided to the wrapper function. The wrapper is executed with
|
|
* the `this` binding of the created function.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Mixed} value The value to wrap.
|
|
* @param {Function} wrapper The wrapper function.
|
|
* @returns {Function} Returns the new function.
|
|
* @example
|
|
*
|
|
* var hello = function(name) { return 'hello ' + name; };
|
|
* hello = _.wrap(hello, function(func) {
|
|
* return 'before, ' + func('moe') + ', after';
|
|
* });
|
|
* hello();
|
|
* // => 'before, hello moe, after'
|
|
*/
|
|
function wrap(value, wrapper) {
|
|
if (!isFunction(wrapper)) {
|
|
throw new TypeError;
|
|
}
|
|
return function() {
|
|
var args = [value];
|
|
push.apply(args, arguments);
|
|
return wrapper.apply(this, args);
|
|
};
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Converts the characters `&`, `<`, `>`, `"`, and `'` in `string` to their
|
|
* corresponding HTML entities.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {String} string The string to escape.
|
|
* @returns {String} Returns the escaped string.
|
|
* @example
|
|
*
|
|
* _.escape('Moe, Larry & Curly');
|
|
* // => 'Moe, Larry & Curly'
|
|
*/
|
|
function escape(string) {
|
|
return string == null ? '' : String(string).replace(reUnescapedHtml, escapeHtmlChar);
|
|
}
|
|
|
|
/**
|
|
* This method returns the first argument provided to it.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {Mixed} value Any value.
|
|
* @returns {Mixed} Returns `value`.
|
|
* @example
|
|
*
|
|
* var moe = { 'name': 'moe' };
|
|
* moe === _.identity(moe);
|
|
* // => true
|
|
*/
|
|
function identity(value) {
|
|
return value;
|
|
}
|
|
|
|
/**
|
|
* Adds function properties of a source object to the `lodash` function and
|
|
* chainable wrapper.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {Object} object The object of function properties to add to `lodash`.
|
|
* @param {Object} object The object of function properties to add to `lodash`.
|
|
* @example
|
|
*
|
|
* _.mixin({
|
|
* 'capitalize': function(string) {
|
|
* return string.charAt(0).toUpperCase() + string.slice(1).toLowerCase();
|
|
* }
|
|
* });
|
|
*
|
|
* _.capitalize('moe');
|
|
* // => 'Moe'
|
|
*
|
|
* _('moe').capitalize();
|
|
* // => 'Moe'
|
|
*/
|
|
function mixin(object) {
|
|
forEach(functions(object), function(methodName) {
|
|
var func = lodash[methodName] = object[methodName];
|
|
|
|
lodash.prototype[methodName] = function() {
|
|
var args = [this.__wrapped__];
|
|
push.apply(args, arguments);
|
|
|
|
var result = func.apply(lodash, args);
|
|
if (this.__chain__) {
|
|
result = new lodashWrapper(result);
|
|
result.__chain__ = true;
|
|
}
|
|
return result;
|
|
};
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Reverts the '_' variable to its previous value and returns a reference to
|
|
* the `lodash` function.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @returns {Function} Returns the `lodash` function.
|
|
* @example
|
|
*
|
|
* var lodash = _.noConflict();
|
|
*/
|
|
function noConflict() {
|
|
window._ = oldDash;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Produces a random number between `min` and `max` (inclusive). If only one
|
|
* argument is provided a number between `0` and the given number will be
|
|
* returned.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {Number} [min=0] The minimum possible value.
|
|
* @param {Number} [max=1] The maximum possible value.
|
|
* @returns {Number} Returns a random number.
|
|
* @example
|
|
*
|
|
* _.random(0, 5);
|
|
* // => a number between 0 and 5
|
|
*
|
|
* _.random(5);
|
|
* // => also a number between 0 and 5
|
|
*/
|
|
function random(min, max) {
|
|
if (min == null && max == null) {
|
|
max = 1;
|
|
}
|
|
min = +min || 0;
|
|
if (max == null) {
|
|
max = min;
|
|
min = 0;
|
|
} else {
|
|
max = +max || 0;
|
|
}
|
|
var rand = nativeRandom();
|
|
return (min % 1 || max % 1)
|
|
? min + nativeMin(rand * (max - min + parseFloat('1e-' + ((rand +'').length - 1))), max)
|
|
: min + floor(rand * (max - min + 1));
|
|
}
|
|
|
|
/**
|
|
* Resolves the value of `property` on `object`. If `property` is a function
|
|
* it will be invoked with the `this` binding of `object` and its result returned,
|
|
* else the property value is returned. If `object` is falsey then `undefined`
|
|
* is returned.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {Object} object The object to inspect.
|
|
* @param {String} property The property to get the value of.
|
|
* @returns {Mixed} Returns the resolved value.
|
|
* @example
|
|
*
|
|
* var object = {
|
|
* 'cheese': 'crumpets',
|
|
* 'stuff': function() {
|
|
* return 'nonsense';
|
|
* }
|
|
* };
|
|
*
|
|
* _.result(object, 'cheese');
|
|
* // => 'crumpets'
|
|
*
|
|
* _.result(object, 'stuff');
|
|
* // => 'nonsense'
|
|
*/
|
|
function result(object, property) {
|
|
var value = object ? object[property] : undefined;
|
|
return isFunction(value) ? object[property]() : value;
|
|
}
|
|
|
|
/**
|
|
* A micro-templating method that handles arbitrary delimiters, preserves
|
|
* whitespace, and correctly escapes quotes within interpolated code.
|
|
*
|
|
* Note: In the development build, `_.template` utilizes sourceURLs for easier
|
|
* debugging. See http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl
|
|
*
|
|
* For more information on precompiling templates see:
|
|
* http://lodash.com/#custom-builds
|
|
*
|
|
* For more information on Chrome extension sandboxes see:
|
|
* http://developer.chrome.com/stable/extensions/sandboxingEval.html
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {String} text The template text.
|
|
* @param {Object} data The data object used to populate the text.
|
|
* @param {Object} options The options object.
|
|
* escape - The "escape" delimiter regexp.
|
|
* evaluate - The "evaluate" delimiter regexp.
|
|
* imports - An object of properties to import into the compiled template as local variables.
|
|
* interpolate - The "interpolate" delimiter regexp.
|
|
* sourceURL - The sourceURL of the template's compiled source.
|
|
* variable - The data object variable name.
|
|
* @returns {Function|String} Returns a compiled function when no `data` object
|
|
* is given, else it returns the interpolated text.
|
|
* @example
|
|
*
|
|
* // using a compiled template
|
|
* var compiled = _.template('hello <%= name %>');
|
|
* compiled({ 'name': 'moe' });
|
|
* // => 'hello moe'
|
|
*
|
|
* // using the "escape" delimiter to escape HTML in data property values
|
|
* _.template('<b><%- value %></b>', { 'value': '<script>' });
|
|
* // => '<b><script></b>'
|
|
*
|
|
* // using the "evaluate" delimiter to generate HTML
|
|
* var list = '<% _.forEach(people, function(name) { %><li><%= name %></li><% }); %>';
|
|
* _.template(list, { 'people': ['moe', 'larry'] });
|
|
* // => '<li>moe</li><li>larry</li>'
|
|
*
|
|
* // using the ES6 delimiter as an alternative to the default "interpolate" delimiter
|
|
* _.template('hello ${ name }', { 'name': 'curly' });
|
|
* // => 'hello curly'
|
|
*
|
|
* // using the internal `print` function in "evaluate" delimiters
|
|
* _.template('<% print("hello " + epithet); %>!', { 'epithet': 'stooge' });
|
|
* // => 'hello stooge!'
|
|
*
|
|
* // using a custom template delimiters
|
|
* _.templateSettings = {
|
|
* 'interpolate': /{{([\s\S]+?)}}/g
|
|
* };
|
|
*
|
|
* _.template('hello {{ name }}!', { 'name': 'mustache' });
|
|
* // => 'hello mustache!'
|
|
*
|
|
* // using the `imports` option to import jQuery
|
|
* var list = '<% $.each(people, function(name) { %><li><%= name %></li><% }); %>';
|
|
* _.template(list, { 'people': ['moe', 'larry'] }, { 'imports': { '$': jQuery });
|
|
* // => '<li>moe</li><li>larry</li>'
|
|
*
|
|
* // using the `sourceURL` option to specify a custom sourceURL for the template
|
|
* var compiled = _.template('hello <%= name %>', null, { 'sourceURL': '/basic/greeting.jst' });
|
|
* compiled(data);
|
|
* // => find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector
|
|
*
|
|
* // using the `variable` option to ensure a with-statement isn't used in the compiled template
|
|
* var compiled = _.template('hi <%= data.name %>!', null, { 'variable': 'data' });
|
|
* compiled.source;
|
|
* // => function(data) {
|
|
* var __t, __p = '', __e = _.escape;
|
|
* __p += 'hi ' + ((__t = ( data.name )) == null ? '' : __t) + '!';
|
|
* return __p;
|
|
* }
|
|
*
|
|
* // using the `source` property to inline compiled templates for meaningful
|
|
* // line numbers in error messages and a stack trace
|
|
* fs.writeFileSync(path.join(cwd, 'jst.js'), '\
|
|
* var JST = {\
|
|
* "main": ' + _.template(mainText).source + '\
|
|
* };\
|
|
* ');
|
|
*/
|
|
function template(text, data, options) {
|
|
var _ = lodash,
|
|
settings = _.templateSettings;
|
|
|
|
text || (text = '');
|
|
options = defaults({}, options, settings);
|
|
|
|
var index = 0,
|
|
source = "__p += '",
|
|
variable = options.variable;
|
|
|
|
var reDelimiters = RegExp(
|
|
(options.escape || reNoMatch).source + '|' +
|
|
(options.interpolate || reNoMatch).source + '|' +
|
|
(options.evaluate || reNoMatch).source + '|$'
|
|
, 'g');
|
|
|
|
text.replace(reDelimiters, function(match, escapeValue, interpolateValue, evaluateValue, offset) {
|
|
source += text.slice(index, offset).replace(reUnescapedString, escapeStringChar);
|
|
if (escapeValue) {
|
|
source += "' +\n_.escape(" + escapeValue + ") +\n'";
|
|
}
|
|
if (evaluateValue) {
|
|
source += "';\n" + evaluateValue + ";\n__p += '";
|
|
}
|
|
if (interpolateValue) {
|
|
source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'";
|
|
}
|
|
index = offset + match.length;
|
|
return match;
|
|
});
|
|
|
|
source += "';\n";
|
|
if (!variable) {
|
|
variable = 'obj';
|
|
source = 'with (' + variable + ' || {}) {\n' + source + '\n}\n';
|
|
}
|
|
source = 'function(' + variable + ') {\n' +
|
|
"var __t, __p = '', __j = Array.prototype.join;\n" +
|
|
"function print() { __p += __j.call(arguments, '') }\n" +
|
|
source +
|
|
'return __p\n}';
|
|
|
|
try {
|
|
var result = Function('_', 'return ' + source)(_);
|
|
} catch(e) {
|
|
e.source = source;
|
|
throw e;
|
|
}
|
|
if (data) {
|
|
return result(data);
|
|
}
|
|
result.source = source;
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Executes the callback `n` times, returning an array of the results
|
|
* of each callback execution. The callback is bound to `thisArg` and invoked
|
|
* with one argument; (index).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {Number} n The number of times to execute the callback.
|
|
* @param {Function} callback The function called per iteration.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns an array of the results of each `callback` execution.
|
|
* @example
|
|
*
|
|
* var diceRolls = _.times(3, _.partial(_.random, 1, 6));
|
|
* // => [3, 6, 4]
|
|
*
|
|
* _.times(3, function(n) { mage.castSpell(n); });
|
|
* // => calls `mage.castSpell(n)` three times, passing `n` of `0`, `1`, and `2` respectively
|
|
*
|
|
* _.times(3, function(n) { this.cast(n); }, mage);
|
|
* // => also calls `mage.castSpell(n)` three times
|
|
*/
|
|
function times(n, callback, thisArg) {
|
|
var index = -1,
|
|
result = Array(n > -1 ? n : 0);
|
|
|
|
while (++index < n) {
|
|
result[index] = callback.call(thisArg, index);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* The inverse of `_.escape` this method converts the HTML entities
|
|
* `&`, `<`, `>`, `"`, and `'` in `string` to their
|
|
* corresponding characters.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {String} string The string to unescape.
|
|
* @returns {String} Returns the unescaped string.
|
|
* @example
|
|
*
|
|
* _.unescape('Moe, Larry & Curly');
|
|
* // => 'Moe, Larry & Curly'
|
|
*/
|
|
function unescape(string) {
|
|
return string == null ? '' : String(string).replace(reEscapedHtml, unescapeHtmlChar);
|
|
}
|
|
|
|
/**
|
|
* Generates a unique ID. If `prefix` is provided the ID will be appended to it.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {String} [prefix] The value to prefix the ID with.
|
|
* @returns {String} Returns the unique ID.
|
|
* @example
|
|
*
|
|
* _.uniqueId('contact_');
|
|
* // => 'contact_104'
|
|
*
|
|
* _.uniqueId();
|
|
* // => '105'
|
|
*/
|
|
function uniqueId(prefix) {
|
|
var id = ++idCounter + '';
|
|
return prefix ? prefix + id : id;
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Creates a `lodash` object that wraps the given `value`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Chaining
|
|
* @param {Mixed} value The value to wrap.
|
|
* @returns {Object} Returns the wrapper object.
|
|
* @example
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 },
|
|
* { 'name': 'curly', 'age': 60 }
|
|
* ];
|
|
*
|
|
* var youngest = _.chain(stooges)
|
|
* .sortBy(function(stooge) { return stooge.age; })
|
|
* .map(function(stooge) { return stooge.name + ' is ' + stooge.age; })
|
|
* .first();
|
|
* // => 'moe is 40'
|
|
*/
|
|
function chain(value) {
|
|
value = new lodashWrapper(value);
|
|
value.__chain__ = true;
|
|
return value;
|
|
}
|
|
|
|
/**
|
|
* Invokes `interceptor` with the `value` as the first argument and then
|
|
* returns `value`. The purpose of this method is to "tap into" a method
|
|
* chain in order to perform operations on intermediate results within
|
|
* the chain.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Chaining
|
|
* @param {Mixed} value The value to provide to `interceptor`.
|
|
* @param {Function} interceptor The function to invoke.
|
|
* @returns {Mixed} Returns `value`.
|
|
* @example
|
|
*
|
|
* _([1, 2, 3, 4])
|
|
* .filter(function(num) { return num % 2 == 0; })
|
|
* .tap(function(array) { console.log(array); })
|
|
* .map(function(num) { return num * num; })
|
|
* .value();
|
|
* // => // [2, 4] (logged)
|
|
* // => [4, 16]
|
|
*/
|
|
function tap(value, interceptor) {
|
|
interceptor(value);
|
|
return value;
|
|
}
|
|
|
|
/**
|
|
* Enables method chaining on the wrapper object.
|
|
*
|
|
* @name chain
|
|
* @memberOf _
|
|
* @category Chaining
|
|
* @returns {Mixed} Returns the wrapper object.
|
|
* @example
|
|
*
|
|
* var sum = _([1, 2, 3])
|
|
* .chain()
|
|
* .reduce(function(sum, num) { return sum + num; })
|
|
* .value()
|
|
* // => 6`
|
|
*/
|
|
function wrapperChain() {
|
|
this.__chain__ = true;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Extracts the wrapped value.
|
|
*
|
|
* @name valueOf
|
|
* @memberOf _
|
|
* @alias value
|
|
* @category Chaining
|
|
* @returns {Mixed} Returns the wrapped value.
|
|
* @example
|
|
*
|
|
* _([1, 2, 3]).valueOf();
|
|
* // => [1, 2, 3]
|
|
*/
|
|
function wrapperValueOf() {
|
|
return this.__wrapped__;
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
// add functions that return wrapped values when chaining
|
|
lodash.after = after;
|
|
lodash.bind = bind;
|
|
lodash.bindAll = bindAll;
|
|
lodash.chain = chain;
|
|
lodash.compact = compact;
|
|
lodash.compose = compose;
|
|
lodash.countBy = countBy;
|
|
lodash.debounce = debounce;
|
|
lodash.defaults = defaults;
|
|
lodash.defer = defer;
|
|
lodash.delay = delay;
|
|
lodash.difference = difference;
|
|
lodash.filter = filter;
|
|
lodash.flatten = flatten;
|
|
lodash.forEach = forEach;
|
|
lodash.functions = functions;
|
|
lodash.groupBy = groupBy;
|
|
lodash.initial = initial;
|
|
lodash.intersection = intersection;
|
|
lodash.invert = invert;
|
|
lodash.invoke = invoke;
|
|
lodash.keys = keys;
|
|
lodash.map = map;
|
|
lodash.max = max;
|
|
lodash.memoize = memoize;
|
|
lodash.min = min;
|
|
lodash.omit = omit;
|
|
lodash.once = once;
|
|
lodash.pairs = pairs;
|
|
lodash.partial = partial;
|
|
lodash.pick = pick;
|
|
lodash.pluck = pluck;
|
|
lodash.range = range;
|
|
lodash.reject = reject;
|
|
lodash.rest = rest;
|
|
lodash.shuffle = shuffle;
|
|
lodash.sortBy = sortBy;
|
|
lodash.tap = tap;
|
|
lodash.throttle = throttle;
|
|
lodash.times = times;
|
|
lodash.toArray = toArray;
|
|
lodash.union = union;
|
|
lodash.uniq = uniq;
|
|
lodash.values = values;
|
|
lodash.where = where;
|
|
lodash.without = without;
|
|
lodash.wrap = wrap;
|
|
lodash.zip = zip;
|
|
|
|
// add aliases
|
|
lodash.collect = map;
|
|
lodash.drop = rest;
|
|
lodash.each = forEach;
|
|
lodash.extend = assign;
|
|
lodash.methods = functions;
|
|
lodash.object = zipObject;
|
|
lodash.select = filter;
|
|
lodash.tail = rest;
|
|
lodash.unique = uniq;
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
// add functions that return unwrapped values when chaining
|
|
lodash.clone = clone;
|
|
lodash.contains = contains;
|
|
lodash.escape = escape;
|
|
lodash.every = every;
|
|
lodash.find = find;
|
|
lodash.has = has;
|
|
lodash.identity = identity;
|
|
lodash.indexOf = indexOf;
|
|
lodash.isArguments = isArguments;
|
|
lodash.isArray = isArray;
|
|
lodash.isBoolean = isBoolean;
|
|
lodash.isDate = isDate;
|
|
lodash.isElement = isElement;
|
|
lodash.isEmpty = isEmpty;
|
|
lodash.isEqual = isEqual;
|
|
lodash.isFinite = isFinite;
|
|
lodash.isFunction = isFunction;
|
|
lodash.isNaN = isNaN;
|
|
lodash.isNull = isNull;
|
|
lodash.isNumber = isNumber;
|
|
lodash.isObject = isObject;
|
|
lodash.isRegExp = isRegExp;
|
|
lodash.isString = isString;
|
|
lodash.isUndefined = isUndefined;
|
|
lodash.lastIndexOf = lastIndexOf;
|
|
lodash.mixin = mixin;
|
|
lodash.noConflict = noConflict;
|
|
lodash.random = random;
|
|
lodash.reduce = reduce;
|
|
lodash.reduceRight = reduceRight;
|
|
lodash.result = result;
|
|
lodash.size = size;
|
|
lodash.some = some;
|
|
lodash.sortedIndex = sortedIndex;
|
|
lodash.template = template;
|
|
lodash.unescape = unescape;
|
|
lodash.uniqueId = uniqueId;
|
|
|
|
// add aliases
|
|
lodash.all = every;
|
|
lodash.any = some;
|
|
lodash.detect = find;
|
|
lodash.findWhere = findWhere;
|
|
lodash.foldl = reduce;
|
|
lodash.foldr = reduceRight;
|
|
lodash.include = contains;
|
|
lodash.inject = reduce;
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
// add functions capable of returning wrapped and unwrapped values when chaining
|
|
lodash.first = first;
|
|
lodash.last = last;
|
|
|
|
// add aliases
|
|
lodash.take = first;
|
|
lodash.head = first;
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
// add functions to `lodash.prototype`
|
|
mixin(lodash);
|
|
|
|
/**
|
|
* The semantic version number.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type String
|
|
*/
|
|
lodash.VERSION = '1.3.1';
|
|
|
|
// add "Chaining" functions to the wrapper
|
|
lodash.prototype.chain = wrapperChain;
|
|
lodash.prototype.value = wrapperValueOf;
|
|
|
|
// add `Array` mutator functions to the wrapper
|
|
forEach(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(methodName) {
|
|
var func = arrayRef[methodName];
|
|
lodash.prototype[methodName] = function() {
|
|
var value = this.__wrapped__;
|
|
func.apply(value, arguments);
|
|
|
|
// avoid array-like object bugs with `Array#shift` and `Array#splice`
|
|
// in Firefox < 10 and IE < 9
|
|
if (!support.spliceObjects && value.length === 0) {
|
|
delete value[0];
|
|
}
|
|
return this;
|
|
};
|
|
});
|
|
|
|
// add `Array` accessor functions to the wrapper
|
|
forEach(['concat', 'join', 'slice'], function(methodName) {
|
|
var func = arrayRef[methodName];
|
|
lodash.prototype[methodName] = function() {
|
|
var value = this.__wrapped__,
|
|
result = func.apply(value, arguments);
|
|
|
|
if (this.__chain__) {
|
|
result = new lodashWrapper(result);
|
|
result.__chain__ = true;
|
|
}
|
|
return result;
|
|
};
|
|
});
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
// some AMD build optimizers, like r.js, check for specific condition patterns like the following:
|
|
if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
|
|
// Expose Lo-Dash to the global object even when an AMD loader is present in
|
|
// case Lo-Dash was injected by a third-party script and not intended to be
|
|
// loaded as a module. The global assignment can be reverted in the Lo-Dash
|
|
// module via its `noConflict()` method.
|
|
window._ = lodash;
|
|
|
|
// define as an anonymous module so, through path mapping, it can be
|
|
// referenced as the "underscore" module
|
|
define(function() {
|
|
return lodash;
|
|
});
|
|
}
|
|
// check for `exports` after `define` in case a build optimizer adds an `exports` object
|
|
else if (freeExports && !freeExports.nodeType) {
|
|
// in Node.js or RingoJS v0.8.0+
|
|
if (freeModule) {
|
|
(freeModule.exports = lodash)._ = lodash;
|
|
}
|
|
// in Narwhal or RingoJS v0.7.0-
|
|
else {
|
|
freeExports._ = lodash;
|
|
}
|
|
}
|
|
else {
|
|
// in a browser or Rhino
|
|
window._ = lodash;
|
|
}
|
|
}(this));
|