keys

List all keys.

Similar: randomKey, keys, has.

function keys(x)
// x: lists

const xlists = require('extra-lists');

var x = [['a', 'b', 'c'], [1, 2, 3]];
[...xlists.keys(x)];
// → [ 'a', 'b', 'c' ]

References

• Array.prototype.values: MDN web docs