# Level Up Your TypeScript Skills with Type Challenges
If you've worked with TypeScript, you know there's a big difference between using basic types and truly mastering the type system. Most tutorials cover the fundamentals, but where do you go when you want to push your type-fu to the next level?
That's exactly what Type Challenges delivers—a curated collection of TypeScript type exercises that range from warm-ups to brain-melting puzzles. Think LeetCode for TypeScript types, complete with an online judge to validate your solutions.
## What It Does
Type Challenges is a GitHub repository filled with TypeScript type problems where you write type-level code to solve challenges. Each problem comes with a set of test cases, and you can verify your solutions directly in the browser using their online playground.
The challenges are organized by difficulty:
- **Easy** - Great for getting comfortable with mapped types, conditionals, and basic utilities
- **Medium** - Introduces more complex type manipulation and pattern matching
- **Hard** - Where things get seriously mind-bending with recursive types and advanced patterns
## Why It's Cool
This isn't just another tutorial site. The hands-on approach forces you to actually apply TypeScript's advanced features rather than just reading about them. You'll find yourself reaching for conditional types, template literal types, and recursive types in ways you probably haven't encountered in day-to-day work.
The online judge is particularly clever—it provides immediate feedback on whether your type solution passes all test cases, just like competitive programming platforms. You can even see community solutions to learn different approaches to the same problem.
Some challenges recreate actual utility types from popular libraries, giving you insight into how tools like Zod or TypeORM implement their complex type magic.
## How to Try It
Head over to the [Type Challenges website](https://tsch.js.org/) and pick any challenge that catches your eye. The interface is straightforward—you'll see the problem statement, test cases, and an editor where you implement your solution.
For example, here's what a simple challenge might look like:
```typescript
// Your task: implement MyPick<T, K>
type MyPick<T, K> = any; // Replace this with your solution
// Test cases
interface Todo {
title: string;
description: string;
completed: boolean;
}
type TodoPreview = MyPick<Todo, 'title' | 'completed'>;
// Should equal { title: string; completed: boolean; }
You can also clone the repository locally and work through challenges in your own environment, then verify them against the test cases.
Final Thoughts
Whether you're looking to strengthen your TypeScript fundamentals or dive deep into advanced type wizardry, Type Challenges strikes the perfect balance between education and entertainment. It's particularly useful if you work on libraries, frameworks, or any codebase where robust type safety matters.
The progression from easy to hard means there's something for every skill level, and the community solutions provide multiple perspectives on solving the same problem. It's one of those resources that makes learning advanced concepts actually enjoyable.
Give it a try—you might be surprised how much you didn't know about TypeScript's type system.
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