Improper async forEach loop

improperAsyncForEach.js

// define a Promise wrapper around the setTimeout function
function wait (fn, time) {
  return new Promise(resolve => setTimeout(() => {fn();resolve();}, time));
}

const arr = ['a', 'b', 'c', 'd'];

// if we want to call an async function for each element in the array
// in series, this would not work:
arr.forEach(async (item, index) => {
  await wait (() => console.log(item), 500);
});