How to convert Map keys to array?

Question

Lets say I have the following map:

let myMap = new Map().set(\'a\', 1).set(\'b\', 2);

And I want to obtain [\'a\', \'b\'] based on the abov

Answer 1

Map.keys() returns a MapIterator object which can be converted to Array using Array.from:

let keys = Array.from( myMap.keys() );
// ["a", "b"]

EDIT: you can also convert iterable object to array using spread syntax

let keys =[ ...myMap.keys() ];
// ["a", "b"]