| /** |
| * Lo-Dash 2.4.1 (Custom Build) <http://lodash.com/> |
| * Build: `lodash modularize exports="node" -o ./compat/` |
| * Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/> |
| * Based on Underscore.js 1.5.2 <http://underscorejs.org/LICENSE> |
| * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors |
| * Available under MIT license <http://lodash.com/license> |
| */ |
| var baseUniq = require('../internals/baseUniq'), |
| createCallback = require('../functions/createCallback'); |
| |
| /** |
| * 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 {*} [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 = (typeof isSorted != 'function' && thisArg && thisArg[isSorted] === array) ? null : isSorted; |
| isSorted = false; |
| } |
| if (callback != null) { |
| callback = createCallback(callback, thisArg, 3); |
| } |
| return baseUniq(array, isSorted, callback); |
| } |
| |
| module.exports = uniq; |