Middle
```javascript console.log("Start"); setTimeout(() => { console.log("Timeout 1"); Promise.resolve().then(() => console.log("Promise inside Timeout")); }, 0); Promise.resolve() .then(() => { console.log("Promise 0"); setTimeout(() => console.log("Timeout inside Promise"), 0); }) .catch(() => console.log("Promise 1")) .then(() => console.log("Promise 2")); requestAnimationFrame(() => { console.log("RequestAnimationFrame"); }); console.log("End"); ```
sobes.tech AI
Answer from AI
The output will be as follows:
Start
End
Promise 0
Promise 2
Timeout 1
Promise inside Timeout
Timeout inside Promise
RequestAnimationFrame
Explanation:
- First, the synchronous code runs:
console.log("Start")andconsole.log("End"). - Then, microtasks (microtasks) are executed — these are promises:
Promise.resolve().then(() => { console.log("Promise 0"); ... })— outputs "Promise 0".- After that, in the chain
.then(() => console.log("Promise 2"))— outputs "Promise 2".
- Macrotasks (macrotasks) — timeouts with
setTimeoutwith zero delay:- The first
setTimeoutoutputs "Timeout 1". - Inside it, a promise is created, which is placed in the microtask queue and outputs "Promise inside Timeout".
- The second
setTimeoutinside the promise outputs "Timeout inside Promise".
- The first
requestAnimationFrameis placed in a separate queue and executed after macrotasks, outputs "RequestAnimationFrame".
Thus, the order is based on the priorities of microtasks (promises), then macrotasks (timeouts), and finally requestAnimationFrame.