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var createAggregator = require('./_createAggregator');
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/**
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 * Creates an array of elements split into two groups, the first of which
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 * contains elements `predicate` returns truthy for, the second of which
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 * contains elements `predicate` returns falsey for. The predicate is
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 * invoked with one argument: (value).
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 *
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 * @static
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 * @memberOf _
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 * @since 3.0.0
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 * @category Collection
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 * @param {Array|Object} collection The collection to iterate over.
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 * @param {Function} [predicate=_.identity] The function invoked per iteration.
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 * @returns {Array} Returns the array of grouped elements.
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 * @example
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 *
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 * var users = [
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 *   { 'user': 'barney',  'age': 36, 'active': false },
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 *   { 'user': 'fred',    'age': 40, 'active': true },
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 *   { 'user': 'pebbles', 'age': 1,  'active': false }
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 * ];
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 *
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 * _.partition(users, function(o) { return o.active; });
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 * // => objects for [['fred'], ['barney', 'pebbles']]
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 *
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 * // The `_.matches` iteratee shorthand.
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 * _.partition(users, { 'age': 1, 'active': false });
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 * // => objects for [['pebbles'], ['barney', 'fred']]
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 *
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 * // The `_.matchesProperty` iteratee shorthand.
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 * _.partition(users, ['active', false]);
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 * // => objects for [['barney', 'pebbles'], ['fred']]
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 *
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 * // The `_.property` iteratee shorthand.
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 * _.partition(users, 'active');
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 * // => objects for [['fred'], ['barney', 'pebbles']]
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 */
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var partition = createAggregator(function(result, value, key) {
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  result[key ? 0 : 1].push(value);
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}, function() { return [[], []]; });
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module.exports = partition;
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