Baseline Widely available
O método keys() retorna um novo objeto iterador que contém as chaves de cada elemento dentro do objeto Map na ordem em que foram inseridos.
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
Um novo objeto Map iterador.
var myMap = new Map();
myMap.set("0", "foo");
myMap.set(1, "bar");
myMap.set({}, "baz");
var mapIter = myMap.keys();
console.log(mapIter.next().value); // "0"
console.log(mapIter.next().value); // 1
console.log(mapIter.next().value); // Object
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