How to make a normal java script function asynchronous?

Firstly The code below prints the value from the call() function which it returns though it takes some time to execute, then it prints the next line.

But I want to make it async behavior so that it first outputs the last line(which execution time is less) than the previous (higher exec time). How can I do that?

function call() {
  let counter = 0;
  for (let i = 0; i < 40000; i++) {
    for (let j = 0; j < 50000; j++) {
  return counter;
console.log('loading ... ');

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