For-Loop / Pass iterator into async callback

iterator_async_callback.js

for (var i = 0; i < array.length; i++) (function (i, arrayElement) {
  // this will create a new variables i and arrayElement for each loop iteration
  // so we can use it in an async callback
  
  doSomeAsync(function callback () {
    console.log(i, arrayElement);
  });
  
}) (i, array[i]);