How to call the setTimeout?

Question

I am being given the below mentioned code and asked to print the console after 3 seconds - B and C after A.

I tried

  setTimeout(main(),3000);

But I get no output.

function sleep(){

}

function main(){

console.log('A');

// call after 3 sec
console.log('B');


// call after 3 sec
console.log('C');

}
}

Answer 1

Above output could also be reproduced using async-await:

function sleep(time) {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve("");
    }, time);
  });
}

async function main() {
  await sleep(0);
  console.log('A');

  // call after 3 sec
  await sleep(3000);
  console.log('B');

  // call after 3 sec
  await sleep(3000);
  console.log('C');

}
main();