TypeScript Generics Tutorial

# TypeScript Generics Tutorial Generics are one of TypeScript's most powerful features, allowing you to write flexible, reusable code while maintaining type safety. ## Basic Generic Function ```typescript function identity(arg: T): T { return arg; } const num = identity(42); const str = identity("hello"); ``` ## Generic Interfaces ```typescript interface Response { data: T; status: number; message: string; } interface User { id: number; name: string; } const response: Response = { data: { id: 1, name: "Alice" }, status: 200, message: "Success" }; ``` ## Generic Constraints Limit the types that can be used with a generic: ```typescript interface HasLength { length: number; } function logLength(arg: T): void { console.log(arg.length); } logLength("hello"); // OK logLength([1, 2, 3]); // OK logLength(42); // Error ``` ## Advanced Patterns ```typescript type Nullable = T | null; type Partial = { [P in keyof T]?: T[P]; }; ``` Generics are essential for writing maintainable TypeScript code. Practice with different patterns to master them.