Practice TypeScript
Scrimba runs TypeScript in the browser player, pause a cast, widen a type, watch the compiler yell, fix it. Pair Learn TypeScript with free JavaScript + React scrims so types meet real components, not toy .ts files.
Who this is for
JS devs who pasted any to ship a feature and now need confidence before the next code review.
TypeScript catches bugs before production; interactive lessons catch misunderstandings before your PR.
Why Practice TypeScript on Scrimba?
Scrimba's interactive format is ideal for TypeScript because:
- Pause and edit, stop the video and modify type annotations to see what happens
- Instant feedback, see TypeScript errors in real-time as you code
- Real projects, build actual applications, not isolated exercises
- No setup required, TypeScript runs in the browser, no local toolchain needed
Top Courses to Practice TypeScript
Learn TypeScript
Level: Intermediate | Access: Pro
Master TypeScript fundamentals: types, interfaces, generics, type narrowing, and utility types. Build real applications while learning type safety.
Learn JavaScript
Level: Beginner | Duration: 9 hrs | Access: Free
TypeScript builds on JavaScript. If you're new to both, start here to learn the language fundamentals before adding types.
Learn React
Level: Intermediate | Duration: 15.1 hrs | Access: Free
Modern React projects increasingly use TypeScript. Learn React fundamentals first, then apply TypeScript to your React components.
TypeScript Practice Exercises
Exercise 1: Type a User Object
// Start with this JavaScript and add types:
const user = {
name: "Alice",
age: 30,
email: "[email protected]",
isActive: true,
};
Practice defining interfaces, optional properties, and readonly modifiers.
Exercise 2: Generic Functions
// Make this function work with any type:
function getFirst(items) {
return items[0];
}
Generics are one of TypeScript's most powerful features. Practice using <T> to create flexible, type-safe functions.
Exercise 3: Union Types for API Responses
// Type this API response handler:
function handleResponse(response) {
if (response.status === "success") {
return response.data;
} else {
throw new Error(response.error);
}
}
Discriminated unions teach you how TypeScript narrows types based on conditions, essential for real API work.
How to Practice Effectively
- Start with JavaScript you know, take existing JS code and add types incrementally
- Use strict mode,
"strict": truein tsconfig.json forces you to handle edge cases - Read the errors, TypeScript errors are verbose but informative. Learn to read them
- Build something real, a todo app, an API client, or a CLI tool in TypeScript
Use this guide when…
You are past syntax tutorials and need typed React + API code without fighting your local tsconfig first.
Related Practice Guides
- Practice JavaScript Arrays, master JS before adding types
- Practice React Hooks, apply TypeScript to React
- Practice API Calls, type your fetch requests
Related Pages
Learn JavaScript first. TypeScript adds types on top of JavaScript, so you need to understand the underlying language. Scrimba's free Learn JavaScript course is a great starting point.
If you already know JavaScript, you can learn basic TypeScript in a week. Mastering advanced features like generics, mapped types, and conditional types takes 2-4 weeks of practice.
Increasingly, yes. Most React job listings now expect TypeScript knowledge. Learning it gives you a significant competitive advantage in the job market.
Write TypeScript inside scrims
Solidify JS on free courses, then add Pro for Learn TypeScript + paths.