Interviewer seni diqqat qilganda 😅 (Promise all)

Interviewer: Can you explain what Promise.all does in JavaScript.
Me: Okay, 𝐏𝐫𝐨𝐦𝐢𝐬𝐞.𝐚𝐥𝐥 𝐢𝐬 𝐥𝐢𝐤𝐞 𝐩𝐮𝐭𝐭𝐢𝐧𝐠 𝐚𝐥𝐥 𝐲𝐨𝐮𝐫 𝐞𝐠𝐠𝐬 𝐢𝐧 𝐨𝐧𝐞 𝐛𝐚𝐬𝐤𝐞𝐭. It takes an array of promises and waits for all of them to be resolved. If one promise fails, the whole thing fails.

Interviewer: How does it handle errors.
Me: If any promise in the array rejects, Promise.all immediately rejects with that error, and the remaining promises' results are ignored.

Interviewer: Can you give an example of its usage.
Me: 𝐈𝐦𝐚𝐠𝐢𝐧𝐞 𝐲𝐨𝐮'𝐫𝐞 𝐥𝐨𝐚𝐝𝐢𝐧𝐠 𝐦𝐮𝐥𝐭𝐢𝐩𝐥𝐞 𝐢𝐦𝐚𝐠𝐞𝐬 𝐨𝐧 𝐚 𝐰𝐞𝐛𝐩𝐚𝐠𝐞. 𝐘𝐨𝐮’𝐝 𝐮𝐬𝐞 𝐏𝐫𝐨𝐦𝐢𝐬𝐞.𝐚𝐥𝐥 𝐭𝐨 𝐰𝐚𝐢𝐭 𝐮𝐧𝐭𝐢𝐥 𝐚𝐥𝐥 𝐢𝐦𝐚𝐠𝐞𝐬 𝐚𝐫𝐞 𝐟𝐮𝐥𝐥𝐲 𝐥𝐨𝐚𝐝𝐞𝐝 𝐛𝐞𝐟𝐨𝐫𝐞 𝐝𝐢𝐬𝐩𝐥𝐚𝐲𝐢𝐧𝐠 𝐭𝐡𝐞𝐦.

Interviewer: What happens if the array passed to Promise.all is empty?
Me: If the array is empty, Promise.all resolves immediately with an empty array, like 𝐚 𝐛𝐚𝐬𝐤𝐞𝐭 𝐰𝐢𝐭𝐡 𝐧𝐨 𝐞𝐠𝐠𝐬.

Interviewer: Can Promise.all handle non-promise values.
Me: Yes, it will treat non-promise values as already resolved promises. So, if you pass a mix of promises and regular values, it will resolve with an array containing the resolved values.

Interviewer: What’s the difference between Promise.all and Promise.allSettled?
Me: Promise.all stops as soon as one promise fails, while Promise.allSettled waits for all promises to complete, regardless of their outcomes. So, Promise.allSettled is like checking every egg in the basket to see if it’s good or bad.

Interviewer: How does Promise.all improve performance in some scenarios?
Me: By running multiple promises concurrently rather than sequentially, Promise.all can significantly speed up tasks like making multiple API calls at once, compared to waiting for each one to finish before starting the next.

@Diyorbekk_dev