keys - nodef/extra-iterable GitHub Wiki

List all indices.

Similar: keys, values, entries.

function keys(x)
// x: an iterable

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

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

References

• Array.prototype.keys: MDN web docs