Async Loop

async-loop.js

// Async version
async function test(){
  for(let i = 0;i < list.length(); i++){
    const data = await getData(i);
    console.log(data);
  }
}
await test();
console.log('done');

// Promise-based version
list
  .reduce(
    (prev, curr) => prev.then(() => getData(curr)),
    Promise.resolve()
  )
  .then(() => console.log('done'));

// If order doesn't matter, just Promise.all()
Promise
  .all(list.map(i => getData(i)))
  .then(() => console.log('done'));