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

87 Mentors

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

34,110 Students

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

98 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.

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Exercism is a great website

Exercism is a great website where I was able to have some very interesting challenges.

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 Makan Taghizadeh

Makan Taghizadeh https://github.com/MakanTaghizadeh

I've developed JavaScript professionally for years and I believe JavaScript is the most flexible programming language on the planet. From backend (Node.js) to frontend (React.js, Angular, Vue.js, ...) to mobile devices (React Native, Native Script, ...), you can develop for so many parallel universes with JavaScript.
Avatar of Hieu Nguyen

Hieu Nguyen GitHub

I'm a javascript developer with deep knowledge in the language itself and NodeJS. Recently i started learning Python as my secondary. Java was used in the past, but no longer my primary language
Avatar of Josh Morrow

Josh Morrow https://github.com/jcmorrow

I didn't feel like I understood JS for the first two years or so that I used it professionally. Once I dug into the prototypical inheritance and functions as a first-class object things really started to click, and ever since ES6 came out it's been a favorite language of mine.
Avatar of Rin Raeuber

Rin Raeuber https://github.com/rin

My grandma taught me BASIC, but I never learnt to whistle. – Originally a Ruby coder, I only recently learnt the ins and outs and this’ and thats of Javascript myself. Lost and overwhelmed? Been there and happy to help.
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 Marcos Brizeno

Marcos Brizeno https://github.com/MarcosX

I like to keep learning about languages, tools and anything that make developing software fun!
Fun. Challenging. Interesting

Community-sourced JavaScript exercises

These are a few of the 98 exercises on the JavaScript track. You can see all the exercises here.

Kindergarten Garden
medium
arrays
control flow conditionals
control flow loops
strings
text formatting
ISBN Verifier
medium
control flow conditionals
control flow loops
pattern recognition
regular expressions
Connect
medium
arrays
control flow conditionals
control flow loops
games
maps
parsing
Anagram
easy
filtering
strings
Two Bucket
medium
algorithms
arrays
control flow conditionals
control flow loops
exception handling
games
parsing
Luhn
medium
control flow conditionals
control flow loops
integers
strings
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