What are the key differences between Promise.all, Promise.any, Promise.race, and Promise.allSettled in JavaScript?

The key difference lies in how these methods handle multiple promises and their outcomes:

Promise.all:

• Resolves only when all promises resolve successfully.
• Rejects immediately if any promise rejects.
• Use it when all tasks must succeed for the next step to proceed.

Promise.any:

• Resolves as soon as the first promise fulfills.
• Rejects only if all promises reject.
• Use it when you only need the fastest successful result.

Promise.race:

• Resolves or rejects as soon as the first promise settles (either resolves or rejects).
• Use it when the timing of the first outcome matters more than whether it succeeded or failed.

Promise.allSettled:

• Resolves when all promises settle, regardless of whether they resolve or reject.
• Provides the status and outcome of each promise.
• Use it when you want to know the result of every promise, even if some fail.