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45 lines
1.6 KiB
JavaScript
45 lines
1.6 KiB
JavaScript
var arrayReduce = require('../internal/arrayReduce'),
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baseEach = require('../internal/baseEach'),
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createReduce = require('../internal/createReduce');
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/**
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* Reduces `collection` to a value which is the accumulated result of running
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* each element in `collection` through `iteratee`, where each successive
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* invocation is supplied the return value of the previous. If `accumulator`
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* is not provided the first element of `collection` is used as the initial
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* value. The `iteratee` is bound to `thisArg` and invoked with four arguments:
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* (accumulator, value, index|key, collection).
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*
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* Many lodash methods are guarded to work as iteratees for methods like
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* `_.reduce`, `_.reduceRight`, and `_.transform`.
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*
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* The guarded methods are:
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* `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `sortByAll`,
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* and `sortByOrder`
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*
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* @static
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* @memberOf _
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* @alias foldl, inject
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* @category Collection
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* @param {Array|Object|string} 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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* @param {*} [thisArg] The `this` binding of `iteratee`.
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* @returns {*} Returns the accumulated value.
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* @example
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*
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* _.reduce([1, 2], function(total, n) {
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* return total + n;
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* });
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* // => 3
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*
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* _.reduce({ 'a': 1, 'b': 2 }, function(result, n, key) {
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* result[key] = n * 3;
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* return result;
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* }, {});
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* // => { 'a': 3, 'b': 6 } (iteration order is not guaranteed)
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*/
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var reduce = createReduce(arrayReduce, baseEach);
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module.exports = reduce;
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