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Join the ReasonML Track
ReasonML is a strongly typed functional language which compiles to both Javascript and native.
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Track mentors

2 Mentors

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

1,066 Students

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

24 Exercises

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

About ReasonML

let message = () => "Welcome to Reason!";

Reason is a syntax and toolchain geared towards Javascript programmers, based on the functional language OCaml

Being statically typed, it is likely to be safer than Javascript, but has powerful type inference which means type annotations do not get in your way.

The Exercism exercises will compile directly to JS, but Reason can be compiled via the OCaml toolchain to native code, IoS, Android, and even microcontrollers

Join the ReasonML track

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 ReasonML Track mentors

Once you join the ReasonML 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 Brad Decker

Brad Decker Website

I believe a strong type system is crucial for building applications that scale. I love ReasonML and OCaml, but have more experience with Typescript
Avatar of Stephen Bastians

Stephen Bastians https://github.com/stevejb71

Reason's a great choice for Javascript programmers who want to get intoi statically typed functional programming.
Fun. Challenging. Interesting

Community-sourced ReasonML exercises

These are a few of the 24 exercises on the ReasonML track. You can see all the exercises here.

Word Count
list map function
pattern recognition
regular expressions
Roman Numerals
All Your Base
RNA Transcription
list map function
Passionate. Knowledgeable. Creative.

Meet the ReasonML Track maintainers

The ReasonML Maintainers are the brains behind the ReasonML 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 with Haskell and ReasonML, emacs lover.

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

Join the ReasonML Track