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.