Generics allow you to create reusable components that work with multiple types while maintaining type safety.
Basic Generic Syntax#
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Generic Functions#
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Generic Interfaces#
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Generic Classes#
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Generic Constraints#
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Default Type Parameters#
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Generic Type Aliases#
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Generic Utility Types#
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Generic Functions with Objects#
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Generic React Components#
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Common Patterns#
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Best Practices#
Naming Conventions:
✓ T for single type parameter
✓ K for key type
✓ V for value type
✓ Descriptive names for complex cases
Constraints:
✓ Use extends for constraints
✓ Prefer specific constraints
✓ Document constraint requirements
✓ Use keyof for property access
Design:
✓ Start simple, add generics when needed
✓ Let TypeScript infer when possible
✓ Use defaults for common cases
✓ Keep type parameters minimal
Avoid:
✗ Unnecessary generics
✗ Too many type parameters
✗ Overly complex constraints
✗ Any as escape hatch
Conclusion#
Generics are fundamental to TypeScript for creating reusable, type-safe code. Start with simple type parameters and add constraints as needed. Use built-in utility types like Partial, Pick, and Record to transform types. Let TypeScript infer types when possible, and provide explicit type arguments only when necessary for clarity or disambiguation.