Iterates over elements of collection invoking 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.

_([1, 2]).forEach(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)