Generics allow you to create reusable components that work with multiple types while maintaining type safety.
Basic Generic Syntax
Loading code block...
Generic Functions
Loading code block...
Generic Interfaces
Loading code block...
Generic Classes
Loading code block...
Generic Constraints
Loading code block...
Default Type Parameters
Loading code block...
Generic Type Aliases
Loading code block...
Generic Utility Types
Loading code block...
Generic Functions with Objects
Loading code block...
Generic React Components
Loading code block...
Common Patterns
Loading code block...
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.