The structuredClone function provides native deep cloning with support for complex types. Here's how to use it effectively.
Basic Usage
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vs Other Methods
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Supported Types
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Unsupported Types
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Transfer Instead of Clone
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Circular References
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Practical Examples
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Form State Snapshot
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Worker Communication
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Deep Freeze with Clone
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Performance Comparison
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Error Handling
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Best Practices
When to Use:
✓ Deep cloning objects
✓ Preserving built-in types
✓ Handling circular refs
✓ State snapshots
✓ Worker communication
Supported Types:
✓ Objects, Arrays
✓ Date, RegExp
✓ Map, Set
✓ ArrayBuffer, TypedArrays
✓ Error objects
Not Supported:
✗ Functions
✗ Symbols
✗ DOM nodes
✗ Class prototypes
Performance:
✓ Faster than JSON for complex objects
✓ Use transfer for large ArrayBuffers
✓ Consider lazy cloning for huge objects
Conclusion
The structuredClone function provides native deep cloning with proper handling of Date, RegExp, Map, Set, ArrayBuffer, and circular references. Use it instead of JSON.parse/stringify for accurate type preservation and instead of spread for true deep copies. Transfer ArrayBuffers for zero-copy performance with large data. Remember that functions, Symbols, and DOM nodes cannot be cloned - handle these cases with custom clone methods or alternatives.