Proxy allows you to intercept and customize fundamental operations on objects. Reflect provides methods for those operations. Here's how to use them.
Basic Proxy
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Validation with Proxy
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Default Values
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Property Access Logging
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Reflect API
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Revocable Proxy
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Observable Pattern
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Negative Array Indices
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Private Properties
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Function Proxy
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Caching Proxy
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DOM Element Proxy
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Type Coercion
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Best Practices
Usage:
✓ Validation and constraints
✓ Logging and debugging
✓ Caching and memoization
✓ Observable state
Reflect:
✓ Use with Proxy traps
✓ Forward default behavior
✓ Handle edge cases
✓ Return proper values
Performance:
✓ Cache proxy instances
✓ Minimize trap overhead
✓ Use for specific needs
✓ Profile impact
Avoid:
✗ Proxying everything
✗ Complex nested proxies
✗ Ignoring invariants
✗ Memory leak risks
Conclusion
Proxy and Reflect provide powerful metaprogramming capabilities in JavaScript. Use Proxy for validation, logging, caching, and reactive state management. Use Reflect to implement default behavior in proxy traps. Be mindful of performance and only use proxies when their benefits outweigh the overhead.