JavaScript provides powerful methods for working with objects. Here's a comprehensive guide.
Object.keys, values, entries#
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Object.assign#
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Object.fromEntries#
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Property Descriptors#
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Object.freeze, seal, preventExtensions#
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Object.create#
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Object.getPrototypeOf, setPrototypeOf#
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Object.is#
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Object.hasOwn#
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Object.getOwnPropertyNames/Symbols#
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Practical Patterns#
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Best Practices#
Immutability:
✓ Use Object.assign({}, obj) or spread
✓ Use Object.freeze for constants
✓ Deep clone when needed
✓ Consider immutable libraries
Property Access:
✓ Use Object.hasOwn over hasOwnProperty
✓ Use optional chaining for nested access
✓ Check for null/undefined
✓ Use default values
Iteration:
✓ Use Object.entries for key-value
✓ Use Object.keys for keys only
✓ Consider for...in with hasOwn
✓ Use Object.fromEntries to reconstruct
Performance:
✓ Avoid Object.setPrototypeOf
✓ Cache Object.keys results
✓ Use Map for frequent additions
✓ Consider frozen objects for constants
Conclusion#
JavaScript's object methods provide powerful tools for manipulation, iteration, and protection. Use Object.entries/fromEntries for transformations, property descriptors for fine-grained control, and Object.freeze/seal for immutability. Modern methods like Object.hasOwn offer safer alternatives to older patterns.