JavaScript provides powerful Object 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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Object.freeze() and Object.seal()#
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Object.defineProperty()#
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Object.getOwnPropertyDescriptor()#
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Object.create()#
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Object.getPrototypeOf() and setPrototypeOf()#
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Object.is()#
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Object.hasOwn()#
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Object.groupBy() (ES2024)#
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Iteration Patterns#
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Best Practices#
Common Methods:
✓ Object.keys/values/entries for iteration
✓ Object.assign for merging
✓ Object.fromEntries for transformation
✓ Object.hasOwn for property checks
Immutability:
✓ Object.freeze for constants
✓ Spread for shallow copies
✓ Deep clone for nested objects
✓ Consider libraries for complex cases
Descriptors:
✓ defineProperty for advanced control
✓ getOwnPropertyDescriptors for cloning
✓ Use for computed properties
✓ Understand enumerable/configurable
Avoid:
✗ Mutating frozen objects
✗ setPrototypeOf in hot paths
✗ hasOwnProperty on null prototype
✗ Confusing === with Object.is
Conclusion#
JavaScript Object methods provide powerful tools for manipulating objects. Use Object.keys/values/entries for iteration, Object.assign or spread for merging, and Object.fromEntries for transformation. For advanced use cases, Object.defineProperty and descriptors offer fine-grained control. Always consider whether you need shallow or deep operations.