Mastering TypeScript Generics: Real-World Patterns

Beyond the Basics

If you've ever written Array<T> or Promise<T>, you've used generics. But TypeScript's type system offers far more powerful patterns that can make your code dramatically safer and more expressive.

Pattern 1: Constrained Generics

Constrain your type parameters to ensure they have the properties you need.

Pattern 2: Generic React Components

Build type-safe, reusable UI components.

Pattern 3: Builder Pattern with Generics

Create fluent APIs that accumulate type information.

Pattern 4: Mapped Types

Transform types systematically. These patterns compose beautifully and form the foundation of most TypeScript utility libraries.