Promises only

promises-only.js

function findFooById(id) {
  // pretend this is a DB query or something asynchronous
  return Promise.resolve({
    id,
    name: 'Foo'
  });
}
function findFoo1() {
  console.log('finding foo 1');
  return findFooById(1);
}
function findFoo2() {
  console.log('finding foo 2');
  return findFooById(2);
}
export default function () {
  return Promise.all([
    findFoo1(),
    findFoo2()
  ]);
}
// Console output:
// finding foo 1
// finding foo 2
// [{"id":1,"name":"Foo"},{"id":2,"name":"Foo"}]