Question 1

What are the best Promise libraries for Node.js performance?

Accepted Answer

Bluebird is often recommended for its performance optimizations and extra features like long stack traces, but for modern Node.js versions, native promises are sufficient and reduce dependency overhead. The list compares these under 'Implementations with extras' to help you decide.

Question 2

How to retry a failed promise in JavaScript?

Accepted Answer

Use utility libraries like p-retry from the list, which provides a simple API for retrying promise-returning functions with configurable attempts and delays. Alternatively, you can implement a manual loop with p-delay for spacing between retries.

Question 3

Bluebird vs native promises: which one should I use?

Accepted Answer

Bluebird offers additional utilities and better performance in some edge cases, but native promises are standard and widely supported in modern environments. If you need features like cancellation or advanced concurrency control, Bluebird is a good choice; otherwise, stick with native for simplicity.

Question 4

Are there Promise polyfills for Internet Explorer?

Accepted Answer

Yes, the list includes polyfills like es6-promise and rsvp.js that are compatible down to IE6. Check the 'Fallbacks' section for libraries that help transition to native promises while maintaining backward compatibility.

Question 5

How to handle multiple API calls with limited concurrency using promises?

Accepted Answer

Utilities like p-limit or p-queue from the list allow you to control concurrency by limiting how many promises run at once. These are modular and easy to integrate, preventing server overload and improving application stability.

Question 6

What resources explain Promise anti-patterns to avoid?

Accepted Answer

The list includes dedicated articles like 'Promise anti-patterns' from Bluebird's wiki and other blogs, which cover common mistakes such as nesting promises or ignoring error handling. These help developers write cleaner, more maintainable async code.

Promises

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