Learn TypeScript by breaking it on purpose
Quick answer: 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.
Last reviewed: March 2026.
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.