Post 28: The Most Common Promise Interview Questions

[honeycoder96]

Epic: #14
Part: VIII — Interview Corner
Series order: 28 of 30

Description

The questions that appear repeatedly across JavaScript interviews — answered properly, not with surface-level answers but with the understanding to explain why.

Key topics

• What are the three Promise states? (And what does "settled" mean?)
• What does .then() return?
• What is the difference between Promise.all and Promise.allSettled?
• What is the difference between Promise.race and Promise.any?
• Why does await in forEach not work?
• What happens if you don't return inside a .then()?
• What is an unhandled promise rejection?
• What is the microtask queue and how does it relate to Promises?
• What is the difference between async/await and Promises?
• Can you cancel a Promise? (And the follow-up: what about AbortController?)