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.
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19,585 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

The reviews are incredibly helpful because they help me see things that I missed, learn about new ways and sometimes interesting discussions that can add a fun twist to maybe a simple problem.

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 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 Derk-Jan Karrenbeld

Derk-Jan Karrenbeld https://github.com/SleeplessByte

Typings for JavaScript is what that language needed. Programming professionally with TypeScript for over 3 years.
Avatar of Randall Koutnik

Randall Koutnik blog

Level 13 JavaScript Wizard
Avatar of André König

André König https://github.com/akoenig

I'm a sofware architect & engineer and I love to share knowledge, because I think that everybody should be able to learn how to develop software.
Avatar of Josh Goebel

Josh Goebel Blog: Running Blind

I mostly write Ruby on Rails professionally but for fun (and possibly profit one day) I dabble with Elixir, TypeScript, Arduino, and such. I’m really digging both TypeScript and Vim lately.
Avatar of Noam Ben Shabat

Noam Ben Shabat GitHub

Full stack developer. Love typescript. Learned and still learning typescript and whould be happy to share my knowledge with others.
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.

Collatz Conjecture
medium
conditionals
exception handling
integers
recursion
math
Resistor Color Duo
easy
strings
arrays
Resistor Color
easy
arrays
strings
Custom Set
medium
arrays
control flow conditionals
control flow loops
data structures
equality
lists
recursion
sets
Perfect Numbers
easy
arrays
control flow conditionals
control flow loops
integers
math
Allergies
medium
arrays
bitwise operations
control flow conditionals
control flow loops
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 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.
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.

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