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93 lines
2.6 KiB
JavaScript
93 lines
2.6 KiB
JavaScript
/**
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* lodash (Custom Build) <https://lodash.com/>
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* Build: `lodash modularize exports="npm" -o ./`
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* Copyright jQuery Foundation and other contributors <https://jquery.org/>
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* Released under MIT license <https://lodash.com/license>
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* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
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* Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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*/
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var baseEachRight = require('lodash._baseeachright'),
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baseIteratee = require('lodash._baseiteratee'),
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baseReduce = require('lodash._basereduce');
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/**
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* A specialized version of `_.reduceRight` for arrays without support for
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* iteratee shorthands.
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*
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* @private
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* @param {Array} array The array to iterate over.
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* @param {Function} iteratee The function invoked per iteration.
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* @param {*} [accumulator] The initial value.
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* @param {boolean} [initAccum] Specify using the last element of `array` as
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* the initial value.
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* @returns {*} Returns the accumulated value.
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*/
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function arrayReduceRight(array, iteratee, accumulator, initAccum) {
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var length = array.length;
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if (initAccum && length) {
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accumulator = array[--length];
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}
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while (length--) {
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accumulator = iteratee(accumulator, array[length], length, array);
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}
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return accumulator;
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}
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/**
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* This method is like `_.reduce` except that it iterates over elements of
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* `collection` from right to left.
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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* @category Collection
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* @param {Array|Object} collection The collection to iterate over.
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* @param {Function} [iteratee=_.identity] The function invoked per iteration.
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* @param {*} [accumulator] The initial value.
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* @returns {*} Returns the accumulated value.
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* @see _.reduce
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* @example
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*
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* var array = [[0, 1], [2, 3], [4, 5]];
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*
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* _.reduceRight(array, function(flattened, other) {
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* return flattened.concat(other);
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* }, []);
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* // => [4, 5, 2, 3, 0, 1]
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*/
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function reduceRight(collection, iteratee, accumulator) {
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var func = isArray(collection) ? arrayReduceRight : baseReduce,
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initAccum = arguments.length < 3;
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return func(collection, baseIteratee(iteratee, 4), accumulator, initAccum, baseEachRight);
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}
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/**
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* Checks if `value` is classified as an `Array` object.
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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* @type {Function}
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is correctly classified,
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* else `false`.
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* @example
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*
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* _.isArray([1, 2, 3]);
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* // => true
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*
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* _.isArray(document.body.children);
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* // => false
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*
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* _.isArray('abc');
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* // => false
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*
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* _.isArray(_.noop);
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* // => false
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*/
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var isArray = Array.isArray;
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module.exports = reduceRight;
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