Promises handle asynchronous operations elegantly. Here's everything you need to know.
Promise Basics
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Promise Static Methods
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Chaining
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Error Handling
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Async/Await
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Advanced Patterns
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Promise Queue
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Common Patterns
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Best Practices
Error Handling:
✓ Always handle rejections
✓ Use try/catch with async/await
✓ Provide meaningful error messages
✓ Consider error recovery strategies
Performance:
✓ Use Promise.all for parallel execution
✓ Avoid unnecessary sequential awaits
✓ Implement timeouts for network calls
✓ Consider request caching
Patterns:
✓ Use Promise.allSettled for mixed results
✓ Implement retry logic for flaky operations
✓ Use queues to limit concurrency
✓ Cancel unnecessary promises when possible
Conclusion
Promises provide powerful abstractions for async code. Use Promise.all for parallel operations, implement proper error handling, and leverage async/await for cleaner syntax. Master patterns like retry, timeout, and queue for robust applications.