keys

List all keys.

Similar: randomKey, keys, has.
Similar: keys, values, entries.

function keys(x)
// x: a map

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

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

References

• Array.prototype.values: MDN web docs