filter

_.filter(collection, [predicate=_.identity])

迭代 collection 的元素，返回 predicate 返回真值的所有元素的数组。使用三个参数调用谓词：(value, index|key, collection)。

¥Iterates over elements of collection, returning an array of all elements predicate returns truthy for. The predicate is invoked with three arguments: (value, index|key, collection).

注意：与 _.remove 不同，此方法返回一个新数组。

¥Note: Unlike _.remove, this method returns a new array.

新增于

¥Since

0.1.0

参数

¥Arguments

1. collection (数组|对象)：要迭代的集合。

   ¥collection (Array|Object): The collection to iterate over.

2. [predicate=_.identity] (函数)：每次迭代调用的函数。

   ¥[predicate=_.identity] (Function): The function invoked per iteration.

返回

¥Returns

(数组)：返回新的过滤数组。

¥(Array): Returns the new filtered array.

示例

¥Example

var users = [
  { 'user': 'barney', 'age': 36, 'active': true },
  { 'user': 'fred',   'age': 40, 'active': false }
];

_.filter(users, function(o) { return !o.active; });
// => objects for ['fred']

// The `_.matches` iteratee shorthand.
_.filter(users, { 'age': 36, 'active': true });
// => objects for ['barney']

// The `_.matchesProperty` iteratee shorthand.
_.filter(users, ['active', false]);
// => objects for ['fred']

// The `_.property` iteratee shorthand.
_.filter(users, 'active');
// => objects for ['barney']

// Combining several predicates using `_.overEvery` or `_.overSome`.
_.filter(users, _.overSome([{ 'age': 36 }, ['age', 40]]));
// => objects for ['fred', 'barney']