94 lessons

TypeScript Lessons

Master TypeScript from core typing and generics through advanced type-system patterns, React+TS, Express+TS, Zod, tRPC and more.

Code preview

typescript

type User = { id: number; name: string };

function label(user: User) {
  return `${user.id}: ${user.name}`;
}

●Type-safe user labels

94 lessons across 11 sections. Every example runs directly in your browser — edit the code and press Run.

Topics covered

Types and interfacesGenericsClassesAPI typing