Async iterators enable iteration over asynchronous data sources. Here's how to use them.
Basic Async Iteration
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Async Generators
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Streaming Data
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Event Streams
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Transforming Async Iterables
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Aggregation Functions
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Concurrent Processing
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Error Handling
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Practical Examples
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Best Practices
Design:
✓ Use async generators for streams
✓ Implement proper cleanup in finally
✓ Handle backpressure appropriately
✓ Consider memory usage
Error Handling:
✓ Wrap iteration in try-catch
✓ Implement retry logic when needed
✓ Add timeouts for safety
✓ Log errors appropriately
Performance:
✓ Use batching for efficiency
✓ Implement concurrency limits
✓ Avoid buffering entire streams
✓ Clean up resources promptly
Testing:
✓ Test with empty iterables
✓ Test error scenarios
✓ Test cancellation
✓ Mock async data sources
Conclusion
Async iterators enable elegant handling of asynchronous data streams. Use async generators for producing values, for-await-of for consumption, and transformation functions for processing. Handle errors properly and implement cleanup in finally blocks.