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.

undefined.

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

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);
}

• Polyfill of Iterator.prototype.forEach in core-js
• Iterator
• Iterator.prototype.find()
• Iterator.prototype.map()
• Iterator.prototype.filter()
• Iterator.prototype.every()
• Iterator.prototype.some()
• Array.prototype.forEach()