What Are Generics?

Generics allow writing components that work with various types while maintaining type safety throughout your code.

function identity(arg: T): T {
  return arg;
}

const num = identity(42);
const str = identity("hello");

Generic Interfaces

interface ApiResponse {
  data: T;
  status: number;
  message: string;
}

type UserResponse = ApiResponse;
type PostsResponse = ApiResponse;

Utility Types

// Partial - all properties optional
type UpdateUser = Partial;

// Pick - select specific properties
type UserName = Pick;

// Omit - exclude properties
type PublicUser = Omit;

Conclusion

Generics make code flexible and type-safe simultaneously. Utility Types reduce repetition and improve maintainability.