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

Map.prototype[@@iterator]() - JavaScript | MDN

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La valeur initiale de la propriété @@iterator est la même fonction que la valeur initiale de la propriété entries.

const map1 = new Map();

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

const iterator1 = map1[Symbol.iterator]();

for (const item of iterator1) {
  console.log(item);
}
// Expected output: Array ["0", "foo"]
// Expected output: Array [1, "bar"]

La fonction d'itération (le symbole @@iterator) de l'objet, par défaut, c'est la fonction entries().

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

var mapIter = myMap[Symbol.iterator]();

console.log(mapIter.next().value); // ["0", "toto"]
console.log(mapIter.next().value); // [1, "truc"]
console.log(mapIter.next().value); // [Object, "bidule"]

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

for (var v of maMap) {
  console.log(v);
}

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