JavaScript Promise Methods Guide

JavaScript provides several Promise combinators for handling multiple async operations. Here's how to use them.

Promise.resolve and Promise.reject#

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Best Practices#

Choosing Methods:
✓ Promise.all - all must succeed
✓ Promise.allSettled - need all results
✓ Promise.race - first to settle
✓ Promise.any - first to succeed

Error Handling:
✓ Always handle rejections
✓ Use specific error types
✓ Add timeouts to prevent hanging
✓ Log errors appropriately

Performance:
✓ Parallelize independent operations
✓ Limit concurrency for resources
✓ Batch large operations
✓ Cancel unnecessary requests

Avoid:
✗ Unhandled promise rejections
✗ Infinite parallel requests
✗ Forgetting await
✗ Nested promise chains

Promise combinators enable powerful async patterns. Use Promise.all when all operations must succeed, Promise.allSettled when you need all results regardless of outcome, Promise.race for timeouts and first-response patterns, and Promise.any for fallback strategies. Combine these with proper error handling for robust async code.

JavaScript Promise Methods Guide

Promise.all#

Promise.allSettled#

Promise.race#

Promise.any#

Promise.resolve and Promise.reject#

Practical Patterns#

Error Handling#

Best Practices#

Conclusion#

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