source: trip-planner-front/node_modules/lodash/reduce.js@ fa375fe

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1var arrayReduce = require('./_arrayReduce'),
2 baseEach = require('./_baseEach'),
3 baseIteratee = require('./_baseIteratee'),
4 baseReduce = require('./_baseReduce'),
5 isArray = require('./isArray');
6
7/**
8 * Reduces `collection` to a value which is the accumulated result of running
9 * each element in `collection` thru `iteratee`, where each successive
10 * invocation is supplied the return value of the previous. If `accumulator`
11 * is not given, the first element of `collection` is used as the initial
12 * value. The iteratee is invoked with four arguments:
13 * (accumulator, value, index|key, collection).
14 *
15 * Many lodash methods are guarded to work as iteratees for methods like
16 * `_.reduce`, `_.reduceRight`, and `_.transform`.
17 *
18 * The guarded methods are:
19 * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`,
20 * and `sortBy`
21 *
22 * @static
23 * @memberOf _
24 * @since 0.1.0
25 * @category Collection
26 * @param {Array|Object} collection The collection to iterate over.
27 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
28 * @param {*} [accumulator] The initial value.
29 * @returns {*} Returns the accumulated value.
30 * @see _.reduceRight
31 * @example
32 *
33 * _.reduce([1, 2], function(sum, n) {
34 * return sum + n;
35 * }, 0);
36 * // => 3
37 *
38 * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
39 * (result[value] || (result[value] = [])).push(key);
40 * return result;
41 * }, {});
42 * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed)
43 */
44function reduce(collection, iteratee, accumulator) {
45 var func = isArray(collection) ? arrayReduce : baseReduce,
46 initAccum = arguments.length < 3;
47
48 return func(collection, baseIteratee(iteratee, 4), accumulator, initAccum, baseEach);
49}
50
51module.exports = reduce;
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