JavaScript Generators Guide

Generators are functions that can pause and resume execution. Here's how to use them effectively.

Best Practices#

Usage:
✓ Use for lazy evaluation
✓ Use for infinite sequences
✓ Use for stateful iteration
✓ Use for async data streams

Patterns:
✓ Combine with yield* for delegation
✓ Use try/finally for cleanup
✓ Handle errors appropriately
✓ Use async generators for I/O

Performance:
✓ Prefer generators for large datasets
✓ Avoid unnecessary array allocations
✓ Use take/limit for infinite generators
✓ Clean up resources in finally

Avoid:
✗ Complex control flow in generators
✗ Forgetting to handle done state
✗ Ignoring cleanup on early exit
✗ Overusing generators for simple cases

Generators provide powerful iteration control with lazy evaluation. Use them for infinite sequences, stateful iteration, async data streams, and memory-efficient processing. Combine with yield* for delegation and async/await for asynchronous operations.

JavaScript Generators Guide

Basic Generators#

Yield Expressions#

Infinite Generators#

Delegating Generators#

Generator Methods#

Async Generators#

Iterator Protocol#

Utility Functions#

Practical Patterns#

Coroutines#

Memory Efficiency#

Best Practices#

Conclusion#

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