keys

Lists all indices. 📦 😺 🏃 📼 🌔 📜 📰 📘

Similar: keys, values, entries.

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

const array = require("extra-array");

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

References

• Array.prototype.keys: MDN web docs