Can I use interfaces, classes, enums, and generics?

Yes. The examples demonstrate these features. Modify types and see compiler guidance.

Generics for Reusable Components

Write reusable utilities with generics. Constrain and infer types to create flexible functions and classes without losing type information.

Try TypeScript Compiler

TypeScript: Generic Function

Write reusable functions with generics.

                          function identity<T>(value: T): T { return value; }
console.log(identity<string>("TS"));
console.log(identity<number>(123));
                        

Output

Keep Practicing

Use the online TypeScript compiler to run examples and test variations. Reinforce learning by building small scripts for each topic.

FAQ

No. This page transpiles TypeScript in the browser to run simple examples. For larger projects, use a local setup with a bundler.

Yes. The examples demonstrate these core TypeScript features. Try modifying types and observe how the compiler enforces correctness.

TypeScript transpiles to JavaScript, so runtime behavior matches JS. Type safety helps you catch errors before execution.

Learn TypeScript by Practicing Examples

Hands-on practice is the fastest way to understand TypeScript. Each example focuses on a single concept—from types, unions, and narrowing to interfaces, classes, generics, and enums. Modify examples, add new functions, and see how type checks guide your code.

Use our tools to deepen learning: the TypeScript Compiler to run snippets, and the TypeScript Tutorial for structured lessons.

Beginner-Friendly

Start with type annotations and unions, then learn narrowing and basic interfaces.

Practical Patterns

Practice classes, generics, enums, tuples, and utility types in small snippets.

Grow Skills

Explore async/await and type guards to build robust, readable code.