Sha256: 3db02ac2a7c5e3b8ca81b254ec13fda168e2be36741397835140e3b374b9fe1f
Contents?: true
Size: 1.81 KB
Versions: 14
Compression:
Stored size: 1.81 KB
Contents
var arrayReduce = require('../internal/arrayReduce'),
baseCallback = require('../internal/baseCallback'),
baseEach = require('../internal/baseEach'),
baseReduce = require('../internal/baseReduce'),
isArray = require('../lang/isArray');
/**
* Reduces `collection` to a value which is the accumulated result of running
* each element in `collection` through `iteratee`, where each successive
* invocation is supplied the return value of the previous. If `accumulator`
* is not provided the first element of `collection` is used as the initial
* value. The `iteratee` is bound to `thisArg`and invoked with four arguments;
* (accumulator, value, index|key, collection).
*
* Many lodash methods are guarded to work as interatees for methods like
* `_.reduce`, `_.reduceRight`, and `_.transform`.
*
* The guarded methods are:
* `assign`, `defaults`, `merge`, and `sortAllBy`
*
* @static
* @memberOf _
* @alias foldl, inject
* @category Collection
* @param {Array|Object|string} collection The collection to iterate over.
* @param {Function} [iteratee=_.identity] The function invoked per iteration.
* @param {*} [accumulator] The initial value.
* @param {*} [thisArg] The `this` binding of `iteratee`.
* @returns {*} Returns the accumulated value.
* @example
*
* var sum = _.reduce([1, 2, 3], function(sum, n) { return sum + n; });
* // => 6
*
* var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, n, key) {
* result[key] = n * 3;
* return result;
* }, {});
* // => { 'a': 3, 'b': 6, 'c': 9 } (iteration order is not guaranteed)
*/
function reduce(collection, iteratee, accumulator, thisArg) {
var func = isArray(collection) ? arrayReduce : baseReduce;
return func(collection, baseCallback(iteratee, thisArg, 4), accumulator, arguments.length < 3, baseEach);
}
module.exports = reduce;
Version data entries
14 entries across 7 versions & 1 rubygems