JavaScript

Join the JavaScript Track
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

106 Mentors

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

43,210 Students

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

99 Exercises

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

About JavaScript

export function 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 for the newest syntax is incomplete in current browsers and the latest node, 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 runtimes are able to run.

Join the JavaScript track

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 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 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 :)
Avatar of Rafael Galdencio

Rafael Galdencio LinkedIn

This mentor has not added their bio yet.
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, Nim, Arduino, and such. I’m really digging both Nim and Vim lately.
Avatar of Rhys Brooker

Rhys Brooker Twitter

Front end developer working with JavaScript and ReactJS. Self taught developer, I enjoy teaching and helping others learn a new language. Contact me on Twitter if you would like more help, I love to network and help.
Avatar of Randall Koutnik

Randall Koutnik blog

Level 13 JavaScript Wizard
Avatar of Philipp Meissner

Philipp Meissner https://github.com/PhilippMeissner

I'm a full-time software developer for ZEIT.IO GmbH, mostly focused on frontend using frameworks like Angular (1-8), Vue and even Elm. On top of that I am quite familiar with Ruby on Rails and NodeJS when it comes to backend.
Fun. Challenging. Interesting

Community-sourced JavaScript exercises

These are a few of the 99 exercises on the JavaScript track. You can see all the exercises here.

Grains
medium
control flow loops
integers
Queen Attack
hard
control flow conditionals
control flow loops
equality
exception handling
optional values
parsing
text formatting
Sieve
medium
control flow conditionals
control flow loops
integers
recursion
math
Twelve Days
medium
control flow conditionals
control flow loops
pattern recognition
polymorfism
regular expressions
strings
ISBN Verifier
medium
control flow conditionals
control flow loops
pattern recognition
regular expressions
Clock
medium
dates
globalization
time
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 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 Tejas Bubane

Tejas Bubane My blog

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

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

Join the JavaScript Track