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52 lines
1.6 KiB
Text
52 lines
1.6 KiB
Text
var arrayFilter = require('./_arrayFilter'),
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baseFilter = require('./_baseFilter'),
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baseIteratee = require('./_baseIteratee'),
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isArray = require('./isArray');
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/**
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* Iterates over elements of `collection`, returning an array of all elements
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* `predicate` returns truthy for. The predicate is invoked with three
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* arguments: (value, index|key, collection).
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*
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* **Note:** Unlike `_.remove`, this method returns a new array.
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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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 new filtered array.
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* @see _.reject
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* @example
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*
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* var users = [
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* { 'user': 'barney', 'age': 36, 'active': true },
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* { 'user': 'fred', 'age': 40, 'active': false }
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* ];
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*
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* _.filter(users, function(o) { return !o.active; });
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* // => objects for ['fred']
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*
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* // The `_.matches` iteratee shorthand.
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* _.filter(users, { 'age': 36, 'active': true });
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* // => objects for ['barney']
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*
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* // The `_.matchesProperty` iteratee shorthand.
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* _.filter(users, ['active', false]);
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* // => objects for ['fred']
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*
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* // The `_.property` iteratee shorthand.
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* _.filter(users, 'active');
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* // => objects for ['barney']
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*
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* // Combining several predicates using `_.overEvery` or `_.overSome`.
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* _.filter(users, _.overSome([{ 'age': 36 }, ['age', 40]]));
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* // => objects for ['fred', 'barney']
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*/
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function filter(collection, predicate) {
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var func = isArray(collection) ? arrayFilter : baseFilter;
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return func(collection, baseIteratee(predicate, 3));
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}
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module.exports = filter;
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