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Showing content from https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Global_Objects/Map/keys below:

Map.prototype.keys() - JavaScript | MDN

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La méthode keys() renvoie un objet Iterator qui contient les clés de chaque élément de l'objet Map, dans leur ordre d'insertion.

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

Un nouvel objet Iterator Map.

var maMap = new Map();
maMap.set("0", "toto");
maMap.set(1, "truc");
maMap.set({}, "bidule");

var mapIter = maMap.keys();

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

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