Enums allow you to define a set of named constants. Here's how to use them effectively in TypeScript.
Numeric Enums
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String Enums
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Heterogeneous Enums
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Computed Enums
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Const Enums
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Reverse Mapping
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Enum as Types
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Enum Iteration
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Enums vs Union Types
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Enum Patterns
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Enum Type Guards
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Common Use Cases
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Best Practices
When to Use Enums:
✓ Fixed set of related constants
✓ Need reverse mapping
✓ IDE autocomplete benefits
✓ Namespace for values
Prefer const enum:
✓ When you don't need runtime object
✓ For performance-critical code
✓ When values are simple
Prefer Union Types:
✓ Simple string literals
✓ No need for iteration
✓ Better tree-shaking needed
✓ Working with APIs
Avoid:
✗ Heterogeneous enums
✗ Complex computed values
✗ Enums for single values
✗ Overusing numeric enums
Conclusion
TypeScript enums provide type-safe constants with IDE support and optional runtime features. Use string enums for readability, const enums for performance, and consider union types or as const objects as alternatives. Choose based on whether you need runtime iteration, reverse mapping, or minimal bundle size.