4.17.11
3.10.1
2.4.2
1.3.1

_.forEach(collection, [iteratee=_.identity])

sourcenpm package

Iterates over elements of collection and invokes iteratee for each element. The iteratee is invoked with three arguments: (value, index|key, collection). Iteratee functions may exit iteration early by explicitly returning false.

Note: As with other "Collections" methods, objects with a "length" property are iterated like arrays. To avoid this behavior use _.forIn or _.forOwn for object iteration.

Since

0.1.0

Arguments

argument
collection
[iteratee=_.identity]
type
(Array|Object)
Function
description
The collection to iterate over.
The function invoked per iteration.

Returns

(array)

Example

_.forEach([1, 2], function (value) {
  console.log(value);
});
// => Logs `1` then `2`.

_.forEach(
  { a: 1, b: 2 },
  function (value, key) {
    console.log(key);
  }
);
// => Logs 'a' then 'b' (iteration order is not guaranteed).

_.forEach([1, 2], function (value) {
  console.log(value);
});
// => Logs `1` then `2`.

_.forEach({ a: 1, b: 2 }, function (value, key) {
  console.log(key);
});
// => Logs 'a' then 'b' (iteration order is not guaranteed).