Iterator.prototype.forEach() - JavaScript

Syntax

forEach(callbackFn)

Parameters

callbackFn

A function to execute for each element produced by the iterator. Its return value is discarded. The function is called with the following arguments:

element: The current element being processed.
index: The index of the current element being processed.

forEach() iterates the iterator and invokes the callbackFn function once for each element. Unlike most other iterator helper methods, it does not work with infinite iterators, because it is not lazy.

Examples

Using forEach()

new Set([1, 2, 3]).values().forEach((v) => console.log(v));

/ Logs:
/ 1
/ 2
/ 3

This is equivalent to:

for (const v of new Set([1, 2, 3]).values()) {
  console.log(v);
}

Specifications

Specification
Iterator Helpers # sec-iteratorprototype.foreach