How to make a normal java script function asynchronous?

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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++) {
      counter++;
    }
  }
  return counter;
}
console.log(call());
console.log('loading ... ');

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