keys

Lists all indices. 🏃 📼 📦 🌔

Similar: keys, values, entries.

iterable.keys(x);
// x: an iterable

const iterable = require('extra-iterable');

var x = [1, 2, 3];
[...iterable.keys(x)];
// [ 0, 1, 2 ]

references

• Array.prototype.keys: MDN web docs