for...of example

for-of.js

var iterable = {
  [Symbol.iterator]: function* generatorWithPromise() {
    // define an array of async data
    const promises = [Promise.resolve(1), Promise.resolve(2)];

    while (promises.length) {
      yield promises.shift();
    }
  }
};

for (item of iterable) {
  item.then(console.log);
}
console.log("done");
// done <- it should be the last to be printed
// 1
// 2