playing around with async/await... it's not as useful as I had hoped it would be

async-await-experimentation.js

var _foo = 0;
async function foo() {
  return new Promise(function (resolve) {
    setTimeout(function () {
      _foo++;
      console.log(_foo);
      resolve(_foo);
    }, 1000);
  });
}

async function useAwait() {
  await foo();
  await foo();
  await foo();
  await foo();
  await foo();
}

async function usePromiseChain() {
  foo()
    .then(function () {
      return foo();
    })
    .then(function () {
      return foo();
    })
    .then(function () {
      return foo();
    })
    .then(function () {
      return foo();
    });
}

async function needsPromiseAll() {
  Promise.all([foo(), foo(), foo()])
    .then(function () {
      return foo();
    })
    .then(function () {
      return foo();
    });
}

// useAwait();
// usePromiseChain();
needsPromiseAll();

You forgot one:

async function needsPromiseAll() {
  return await Promise.all([foo(), foo(), foo()]).then(foo).then(foo);
}