HORIZON PROJECT

var createAggregator = require('./_createAggregator');

/**

 * Creates an array of elements split into two groups, the first of which

 * contains elements `predicate` returns truthy for, the second of which

 * contains elements `predicate` returns falsey for. The predicate is

 * invoked with one argument: (value).

 *

 * @static

 * @memberOf _

 * @since 3.0.0

 * @category Collection

 * @param {Array|Object} collection The collection to iterate over.

 * @param {Function} [predicate=_.identity] The function invoked per iteration.

 * @returns {Array} Returns the array of grouped elements.

 * @example

 *

 * var users = [

 *   { 'user': 'barney',  'age': 36, 'active': false },

 *   { 'user': 'fred',    'age': 40, 'active': true },

 *   { 'user': 'pebbles', 'age': 1,  'active': false }

 * ];

 *

 * _.partition(users, function(o) { return o.active; });

 * // => objects for [['fred'], ['barney', 'pebbles']]

 *

 * // The `_.matches` iteratee shorthand.

 * _.partition(users, { 'age': 1, 'active': false });

 * // => objects for [['pebbles'], ['barney', 'fred']]

 *

 * // The `_.matchesProperty` iteratee shorthand.

 * _.partition(users, ['active', false]);

 * // => objects for [['barney', 'pebbles'], ['fred']]

 *

 * // The `_.property` iteratee shorthand.

 * _.partition(users, 'active');

 * // => objects for [['fred'], ['barney', 'pebbles']]

 */

var partition = createAggregator(function(result, value, key) {

  result[key ? 0 : 1].push(value);

}, function() { return [[], []]; });

module.exports = partition;