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

129 Mentors

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

68,023 Students

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

103 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, a programming language that allows web pages to be dynamic. It is an interpreted language, which means that it doesn't need to be compiled: instead the interpreter (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*!

JavaScript is not only for use in the browser. JavaScript runtimes, such as NodeJS and deno allow you to write, launch and serve requests on webservers. Other frameworks, such as Electron use JavaScript to write cross platform applications for Windows, Linux and Mac OS. Mobile app development is also a possibility, utilising react-native, ionic and various others, with expo now allowing to target Android, iOS and the web, all at once.

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.

But because new syntax and features are coming to JavaScript each year, support for these changes is often incomplete in current browsers and the latest node. This doesn't mean we can't use it. Tools such as Babel offer transpilation for most features, allowing us to write as if it's the future.

Note: This track supports the latest ECMAScript syntax via Babel and the @babel/preset-env plugin, and new experimental features are enabled with each update of that plugin, matching the release of the specifications. It automatically adapts to your local node installation. This means you don't need to worry about what is and isn't supported.


* There is a small number of browsers that doesn't ship with a JavaScript runtime, or that has disabled JavaScript execution by default.

Join the JavaScript track

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 Jared Mortenson

Jared Mortenson https://github.com/cjaredm

I love learning to the point I got degrees in how/why people think the way they do and how to teach them. Then I learned how to program and have been trying to teach others as often as I can. Hope I can help.
Avatar of Tyll Weiß

Tyll Weiß https://github.com/Inkdpixels

I love JavaScript for it's flexibility and fast-paced community. I've written and maintained quite a bit of Node and browser oriented Javascript projects, both personally and professionally.
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 Chris Strolia-Davis

Chris Strolia-Davis https://github.com/cstroliadavis

I've been developing with JavaScript/EcmaScript for about 2 decades. I've been helped by many and I'm happy to help others.
Avatar of Thomas Gamble

Thomas Gamble https://github.com/gambtho

Enjoy solving problems and helping others learn. I've written javascript professionally, and also use it for open source projects.
Avatar of Brandon A Welsh

Brandon A Welsh https://github.com/BrandonArmand

Javascript is the first line of defense! Reach out to me and get in touch with any questions or collaborations, I love to network and help.
Fun. Challenging. Interesting

Community-sourced JavaScript exercises

These are a few of the 103 exercises on the JavaScript track. You can see all the exercises here.

Connect
medium
arrays
games
maps
parsing
conditionals
loops
Word Count
easy
lists
regular expressions
strings
loops
Binary Search Tree
medium
algorithms
recursion
conditionals
loops
Prime Factors
medium
algorithms
integers
math
conditionals
loops
RNA Transcription
easy
strings
transforming
Strain
medium
algorithms
arrays
callbacks
filtering
lists
conditionals
loops
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.

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