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TypeScript

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TypeScript is a language for writing more maintainable JavaScript. TypeScript adds optional types, classes, and modules to JavaScript.
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Track mentors

26 Mentors

Our mentors are friendly, experienced TypeScript developers who will help teach you new techniques and tricks.
Track students

19,766 Students

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Track exercises

91 Exercises

Hundreds of hours have gone into making these exercises fun, useful, and challenging to help you enjoy learning.

About TypeScript

class HelloWorld {
  static hello(name = 'World') {
        return `Hello, ${name}!`
    }
}

export default HelloWorld

TypeScript (TS) is a superset of JavaScript (JS), created at Microsoft in response to frustration developing large-scale applictions in JS. In a large JS project, knowing what properties your own objects have, what arguments your functions take (and what type they need to be) can become difficult. Similarly, since there is no ability to intelligently inspect JS code, when you include a package (like from npm), you have to keep the documentation up so you know what methods are available and what arguments they take. TS solves these issues. It is currently an open-source project hosted on Github. It supports tools for any browser as well as Node, for any host, on any OS. TTS compiles to readable, standards-based JavaScript.

TS adds a flexible type system to JS, in addition to interfaces (custom types) and modifying the syntax of some ECMAScript features such as classes. Types are optional and flexible (for example, you can specify an argument is a string OR a number). Types allow tooling available in most code editors that improve the development experience such as code completion and method detection, both in your own code and in packages you use. It supports many upcoming ECMASCript features (such as async/await). TS can be written in OO or functional styles. It is compatible with all existing JS packages. TS transpiles to clean, readable JS.

Try it out at the playground, and stay up to date via the Typescript blog and Twitter account.

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Exercism is a great website

What I like about it is that I am able to solve the challenges in a TDD way working in a environment that I am familiar (my own PC not a browser IDE) and the cherry on the top of the cake is that I have access to code reviews.

Relaxed. Encouraging. Supportive.

Meet the TypeScript Track mentors

Once you join the TypeScript language track, you will receive support and feedback from our team of mentors. Here are the bios of a few of the mentors of this track.

Avatar of Giorgio Delgado

Giorgio Delgado Personal Site

I'm a full-stack developer interested in functional programming and statically-typed languages. The geek in me thinks that the world needs more Elm.
Avatar of Brenton Alker

Brenton Alker https://github.com/tekerson

As a believer in the communicative power of type systems, I think TypeScript has an opportunity to bring lessons learned in other communities to the world of front-end web development.
Avatar of Tyll Weiß

Tyll Weiß https://github.com/Inkdpixels

I love TypeScript for it's advance in features and type-safety, all while still being close to Javascript. I've written and maintained quite a bit of TypeScript projects, both personally and professionally.
Avatar of Randall Koutnik

Randall Koutnik blog

Level 13 JavaScript Wizard
Avatar of Aleksander Heintz

Aleksander Heintz My blog

I love programming, and do it both professionally and as a hobby. At work I do most javascript and typescript, but I've also done a lot of F# and C#.
Avatar of Steve Jung

Steve Jung https://github.com/steve-lemon

Professional in Javascript for decode, and adaptive to TypeScript during recent 3 years
Fun. Challenging. Interesting

Community-sourced TypeScript exercises

These are a few of the 91 exercises on the TypeScript track. You can see all the exercises here.

RNA Transcription
easy
strings
transforming
Transpose
medium
arrays
control flow conditionals
control flow loops
lists
matrices
strings
text formatting
Run Length Encoding
easy
control flow conditionals
exception handling
parsing
pattern recognition
regular expressions
strings
text formatting
Accumulate
medium
algorithms
callbacks
control flow conditionals
lists
Circular Buffer
hard
arrays
control flow conditionals
control flow loops
data structures
exception handling
lists
Luhn
medium
control flow conditionals
control flow loops
integers
strings
Passionate. Knowledgeable. Creative.

Meet the TypeScript Track maintainers

The TypeScript Maintainers are the brains behind the TypeScript Track. They spend their spare time creating interesting and challenging exercises that we can all learn from. We are incredibly grateful for their hard work. Here are the bios of a few of the maintainers of this track.

Avatar of Derk-Jan Karrenbeld

Derk-Jan Karrenbeld My website

All-round programmer, manager and owner of a Dutch software agency specializing in bespoke and tailored code.
Avatar of Cristian Rivas Gómez

Cristian Rivas Gómez

I am a Software Engineering student from San Sebastian. I enjoy a lot reading about topics related to Java, software maintainability and web technologies. My love for TypeScript began developing web apps with Angular framework.

Get started with the TypeScript track. As with everything on Exercism, it's 100% free!

Join the TypeScript Track