function getOrder() {
  console.log('1');
  
  setTimeout(() => console.log('2'), 0);
  
  Promise.resolve().then(() => {
    console.log('3');
    Promise.resolve().then(() => console.log('4'));
  });
  
  Promise.resolve().then(() => console.log('5'));
  
  console.log('6');
}

getOrder();