| /** |
| * Lo-Dash 2.4.1 (Custom Build) <http://lodash.com/> |
| * Build: `lodash modularize underscore exports="node" -o ./underscore/` |
| * 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 createCallback = require('../functions/createCallback'), |
| forEachRight = require('./forEachRight'); |
| |
| /** |
| * 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 {*} [accumulator] Initial value of the accumulator. |
| * @param {*} [thisArg] The `this` binding of `callback`. |
| * @returns {*} 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 = createCallback(callback, thisArg, 4); |
| forEachRight(collection, function(value, index, collection) { |
| accumulator = noaccum |
| ? (noaccum = false, value) |
| : callback(accumulator, value, index, collection); |
| }); |
| return accumulator; |
| } |
| |
| module.exports = reduceRight; |