Proxy enables custom behavior for fundamental operations. Here's how to use it effectively.
Basic Proxy#
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Common Traps#
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Validation#
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Reactive Programming#
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Default Values#
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Access Control#
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Function Proxies#
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Array Proxy#
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Reflect API#
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Best Practices#
Design:
✓ Use Reflect for default behavior
✓ Always return from set trap
✓ Preserve prototype chain
✓ Handle all edge cases
Performance:
✓ Avoid proxying hot paths
✓ Cache proxy instances
✓ Minimize trap operations
✓ Profile performance impact
Patterns:
✓ Validation and type checking
✓ Change detection/reactivity
✓ Access control
✓ Logging and debugging
Avoid:
✗ Overusing proxies
✗ Forgetting receiver argument
✗ Breaking invariants
✗ Circular proxy chains
Conclusion#
Proxy and Reflect enable powerful metaprogramming in JavaScript. Use them for validation, reactivity, access control, and function decoration. Always use Reflect for default behavior and be mindful of performance implications.