async.js

async function add3(x) {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve(x + 3);
    }, 2000);
  });
}

async function t3() {
  let x;
  return new Promise(resolve => {
    setTimeout(() => {
      x = 24;
      resolve(x);
    }, 2000);
  });
}

async function print(){
  var k = await t3();
  var l = await add3(k)
  console.log(l);
}


print()