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

16 Mentors

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

2,803 Students

Join thousands of students who have enjoyed learning and improving their skills by taking this track.
Track exercises

87 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.

Join the TypeScript track

A tremendous learning opportunity to explore the depth of your own knowledge

Exercism is fantastic in learning new languages but that is not the extent of it. If you are a "more experienced" programmer you may have encountered impostor syndrome: the idea you don't really know what you think you know. Exercism lets you solve problems and put them in the space of open feedback which is a tremendous learning opportunity to explore the depth of your own knowledge. Even if you have been programming in a language for awhile it is worth checking into Exercism to see where you stand with current implementation practices.

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 Brenton Alker

Brenton Alker 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 Vitor Fernandes

Vitor Fernandes https://github.com/vmlf01

I'm a fullstack developer working mostly with Node and Angular. I've been tracking TypeScript evolution since version 1.8 and I've used C# for most of my career, so I'm no stranger to types!
Avatar of Ryan Boris

Ryan Boris GitHub

I have written TypeScript as part of various frameworks, open source projects, and profesionally. I've also taught TypeScript via webinar and tutorials that were part of my weekly dev-based webcast. Please feel free to ask me any questions!
Avatar of Christoph Lipp

Christoph Lipp https://github.com/ser1us

I mainly use Typescript at work and I really appreciate the type safety it provides. Combine it with the awesome Visual Studio Code and you're in for a treat. Another well done language by Microsoft.
Avatar of Cody Hoover

Cody Hoover https://github.com/hoovercj

I got started using typescript to write VS Code extensions such as Power Mode. I now mentor use it daily in my role as a front-end developer and mentor others on my team as we migrate more and more of our codebase to typescript.
Avatar of Randall Koutnik

Randall Koutnik blog

Level 13 JavaScript Wizard
Fun. Challenging. Interesting

Community-sourced TypeScript exercises

These are a few of the 87 exercises on the TypeScript track. You can see all the exercises here.

House
medium
arrays
control flow conditionals
control flow loops
recursion
strings
Phone Number
medium
parsing
transforming
Wordy
medium
control flow conditionals
control flow loops
exception handling
parsing
pattern recognition
regular expressions
strings
Gigasecond
easy
time
List Ops
hard
data structures
lists
recursion
Reverse String
easy
for
loops
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 Dave Sudia

Dave Sudia

I'm a career-changer from education, and I used Exercism to reinforce my skills as I made the switch. I love TypeScript for the flexibility of JS with the consistency of strongly typed languages. Maintaining the TS track has grown my appreciation for the language.
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.

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