JavaScript Promise Methods Guide

JavaScript Promises provide powerful methods for handling async operations. Here's a comprehensive guide to all Promise methods.

Promise.resolve() & Promise.reject()#

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Best Practices#

Error Handling:
✓ Always add catch handlers
✓ Use finally for cleanup
✓ Re-throw when appropriate
✓ Log unexpected errors

Patterns:
✓ Use Promise.all for parallel
✓ Use Promise.allSettled for batch
✓ Use Promise.race for timeout
✓ Use Promise.any for redundancy

Performance:
✓ Start promises early
✓ Limit concurrency
✓ Avoid unnecessary awaits
✓ Use parallel when possible

Avoid:
✗ Unhandled rejections
✗ Nesting promises unnecessarily
✗ Mixing callbacks and promises
✗ Forgetting to return promises

Promise methods provide powerful tools for managing async operations. Use Promise.all() for parallel execution, Promise.allSettled() when you need all results regardless of failures, Promise.race() for timeouts, and Promise.any() for redundant sources. Always handle errors appropriately and consider concurrency limits for batch operations.

JavaScript Promise Methods Guide

Promise.all()#

Promise.allSettled()#

Promise.race()#

Promise.any()#

Promise.resolve() & Promise.reject()#

Promise.withResolvers()#

Chaining Promises#

Error Handling#

Concurrent Patterns#

Creating Promises#

Practical Patterns#

Best Practices#

Conclusion#

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