JavaScript

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JavaScript is a scripting language, primarily used for creating dynamic websites and programming web servers. It's a very popular language, and supports a variety of programming paradigms.
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Track mentors

79 Mentors

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

29,575 Students

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

96 Exercises

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

About JavaScript

export class HelloWorld {
  hello() {
    return 'Hello, World!';
  }
};

ECMAScript is the standard that defines JavaScript, the language that allows web pages to be dynamic. It is an interpreted language, which means that it doesn't need to be compiled by the programmer: instead the client (such as a web browser) will parse the code and turn it into code that their machine can run - suitable for creating dynamic websites that can run on any browser on any computer!

In addition to use in web pages with modern web browsers, and it can also be executed on servers where the NodeJS platform is installed where it can be used for creating a web server too.

"ECMAScript has grown to be one of the world’s most widely used general purpose programming languages. It is best known as the language embedded in web browsers but has also been widely adopted for server and embedded applications." —ECMA International Language Specification

Starting with the 6th edition (commonly known as ES2015 or ES6) in 2015, a new edition of the standard will be released each year. The 6th edition was a major update which brought many enhancements over ES5, including notably template strings, expressive arrow function syntax, and cleaner syntax for defining classes.

However, support in current browsers is incomplete, and often requires transpilation with a tool like Babel.

_Note: This track supports the latest ECMAScript syntax via Babel and the babel-preset-env plugin, and new experimental features will be enabled with each release of the specification. Here, you will find code that not all browsers are able to run.

Join the JavaScript 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 JavaScript Track mentors

Once you join the JavaScript 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 Nastassia Danilova

Nastassia Danilova GitHub

I am very passionate about JavaScript. I have a lot of experience in different sized projects, but I'll never stop to learn something new every day. I'll be happy to help you
Avatar of James George

James George https://github.com/jamesgeorge007

I'm a Full Stack JavaScript Developer. What made me fell in love with JS is that, it can be used to build absolutely anything.
Avatar of Michael Anderson

Michael Anderson https://github.com/usufruct

ECMAScript is the hobo of the internet. It is also the train I took into the world of software years ago.
Avatar of Christoph Lipp

Christoph Lipp https://github.com/ser1us

What can I say... it's Javascript alright :) I try to avoid pure JS as much as I can. But, it's the language of the web and the more you know about its many pitfalls the better :)
Avatar of CJ Ting

CJ Ting https://github.com/fate-lovely

To be honest, I don't like JS that much, but I've been writting it professionally for a long time. If you use it carefully, it's a wonderful language.
Avatar of Marzi Morovatpasand

Marzi Morovatpasand https://github.com/marzieh312

Really enjoying coding in Javascript and love to be part of the joy of learning it for anybody else :)
Fun. Challenging. Interesting

Community-sourced JavaScript exercises

These are a few of the 96 exercises on the JavaScript track. You can see all the exercises here.

Perfect Numbers

easy
arrays
control flow conditionals
control flow loops
integers
math

Secret Handshake

medium
algorithms
arrays
bitwise operations
control flow conditionals
control flow loops
games

Armstrong Numbers

easy
algorithms
math

Minesweeper

medium
algorithms
arrays
games

Forth

hard
domain specific languages
parsing
stacks
Passionate. Knowledgeable. Creative.

Meet the JavaScript Track maintainers

The JavaScript Maintainers are the brains behind the JavaScript 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 Tejas Bubane

Tejas Bubane My blog

Primarily a Ruby & Javascript coder, getting better at functional programming, emacs lover.
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.

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

Join the JavaScript Track