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Showing content from http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/keys below:

Map.prototype.keys() - JavaScript | MDN

Baseline Widely available

The keys() method of Map instances returns a new map iterator object that contains the keys for each element in this map in insertion order.

const map1 = new Map();

map1.set("0", "foo");
map1.set(1, "bar");

const iterator1 = map1.keys();

console.log(iterator1.next().value);
// Expected output: "0"

console.log(iterator1.next().value);
// Expected output: 1

None.

A new iterable iterator object.

const myMap = new Map();
myMap.set("0", "foo");
myMap.set(1, "bar");
myMap.set({}, "baz");

const mapIter = myMap.keys();

console.log(mapIter.next().value); // "0"
console.log(mapIter.next().value); // 1
console.log(mapIter.next().value); // {}

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