Async and Await Function

gistfile1.txt

let counter = 0;

function doSomethingAsync(id, start) {
  return new Promise(resolve => {
    setTimeout(() => {
      counter++;
      const stop = new Date();    
      const runningTime = getSeconds(start, stop);
      resolve(`result${id} completed in ${runningTime} seconds`);
    }, 2000);
  });
}

function getSeconds(start, stop) {
  return (stop - start) / 1000;
}

async function test() {
  console.log('Awaiting 3 Async calls');
  console.log(`Counter before execution: ${counter}`);
  const start = new Date();
  
  const [result1, result2, result3] = await Promise.all([
        doSomethingAsync(1, new Date()),
        doSomethingAsync(2, new Date()),
        doSomethingAsync(3, new Date())
  ]);
  
  const stop = new Date();

  console.log(result1, result2, result3);
  console.log(`Counter after all ran: ${counter}`);
  console.log(`Total time to run: ${getSeconds(start, stop)}`);
 }