Exercism v3 launches on Sept 1st 2021. Learn more! 🚀🚀🚀


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

2 Mentors

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

1,073 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

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 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 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.
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
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.

control flow conditionals
pattern recognition
regular expressions
Armstrong Numbers
Phone Number
regular expressions
Two Fer
string interpolation
regular expressions
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