Source @ github

Array.keys

keys — Returns an ArrayIterator with the keys of the array.

Description

Array.keys()

Changelog

Version Description
ES 6 Introduced.

Examples

Example #1 – keys example
var array = [2, 4, 8];
var keys = array.keys();

console.log(typeof keys);  // object
console.log(keys);         // ArrayIterator {}

External references