Guess the output #2

Guess the output #2

Question:

console.log("start");

setTimeout(() => {
  console.log("setTimeout");
});

Promise.resolve().then(() => {
  console.log("resolve");
});

console.log("end");

Output:

start
end
resolve
setTimeout

Explanation: 

1. console.log("start");: This line is executed immediately, so start is printed first.
2. setTimeout(() => { console.log("setTimeout"); });: The callback inside setTimeout is scheduled to run after the current event loop finishes, putting it into the macrotask queue. Thus, setTimeout is delayed.
3. Promise.resolve().then(() => { console.log("resolve"); });: This creates a microtask that will be executed after the current synchronous code finishes, but before any macrotasks. Therefore, resolve is logged before setTimeout.
4. console.log("end");: This line is executed immediately after the first log, so end is printed second.