Quick JavaScript Crash Course - Modern and Advanced JavaScript - Promises-any-vs-race

This lecture continues from the previous one, focusing on Promise.any, a function introduced in ES2021. It compares Promise.any with Promise.allSettled, highlighting that Promise.any resolves with the first resolved promise, unlike Promise.allSettled, which waits for all promises to settle. The lecture includes code examples demonstrating Promise.any's behavior, error handling, and a brief introduction to Promise.race, which resolves with the first settled promise, regardless of its state. The lecture concludes with a summary of these concepts.

What is the main difference between Promise.allSettled and Promise.any?

• Promise.allSettled and Promise.any both wait for all promises to settle.

• Promise.allSettled and Promise.any both resolve with the first promise to settle.

• Promise.allSettled resolves with the first promise, while Promise.any waits for all promises to settle.

• Promise.allSettled waits for all promises to settle, while Promise.any resolves with the first resolved promise.

What does Promise.any return when all promises are rejected?

• The first rejected promise

• An AggregateError

• An empty array

• The last rejected promise

How does Promise.any determine which promise to resolve with?

• It resolves with the last promise to settle.

• It resolves with the first promise to be rejected.

• It resolves with the first promise to be resolved.

• It resolves with the promise that takes the longest time.

What is the key difference between Promise.any and Promise.race?

• Promise.any resolves with the first resolved promise, while Promise.race resolves or rejects with the first promise to settle.

• Promise.any and Promise.race both resolve with the first promise to settle.

• Promise.any waits for all promises to settle, while Promise.race resolves with the first promise to settle.

• Promise.any resolves with the first promise to settle, while Promise.race waits for all promises.

Which ECMAScript version introduced Promise.any?

• ES2020

• ES2021

• ES2017

• ES2015