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37 lines
1.1 KiB
JavaScript
37 lines
1.1 KiB
JavaScript
5 years ago
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var arrayReduceRight = require('./_arrayReduceRight'),
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baseEachRight = require('./_baseEachRight'),
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baseIteratee = require('./_baseIteratee'),
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baseReduce = require('./_baseReduce'),
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isArray = require('./isArray');
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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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module.exports = reduceRight;
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