function* gen() {
  yield *[1,1];
  yield 2;
  yield 3;
}

const generator = gen();

console.log(generator.next().value);
console.log(generator.next().value);

for (const value of generator) {
  console.log(value);
}

const map = new Map();
const key1 = {};
const key2 = key1;

map.set(key1, "Value for key1");
map.set(key2, "Value for key2");

console.log(map.get({}));
console.log(map.get(key1));

#javascript