partition.js (1518B)
1 var createAggregator = require('./_createAggregator'); 2 3 /** 4 * Creates an array of elements split into two groups, the first of which 5 * contains elements `predicate` returns truthy for, the second of which 6 * contains elements `predicate` returns falsey for. The predicate is 7 * invoked with one argument: (value). 8 * 9 * @static 10 * @memberOf _ 11 * @since 3.0.0 12 * @category Collection 13 * @param {Array|Object} collection The collection to iterate over. 14 * @param {Function} [predicate=_.identity] The function invoked per iteration. 15 * @returns {Array} Returns the array of grouped elements. 16 * @example 17 * 18 * var users = [ 19 * { 'user': 'barney', 'age': 36, 'active': false }, 20 * { 'user': 'fred', 'age': 40, 'active': true }, 21 * { 'user': 'pebbles', 'age': 1, 'active': false } 22 * ]; 23 * 24 * _.partition(users, function(o) { return o.active; }); 25 * // => objects for [['fred'], ['barney', 'pebbles']] 26 * 27 * // The `_.matches` iteratee shorthand. 28 * _.partition(users, { 'age': 1, 'active': false }); 29 * // => objects for [['pebbles'], ['barney', 'fred']] 30 * 31 * // The `_.matchesProperty` iteratee shorthand. 32 * _.partition(users, ['active', false]); 33 * // => objects for [['barney', 'pebbles'], ['fred']] 34 * 35 * // The `_.property` iteratee shorthand. 36 * _.partition(users, 'active'); 37 * // => objects for [['fred'], ['barney', 'pebbles']] 38 */ 39 var partition = createAggregator(function(result, value, key) { 40 result[key ? 0 : 1].push(value); 41 }, function() { return [[], []]; }); 42 43 module.exports = partition;