let message = () => "Welcome to Reason!";
Get better at programming through fun, rewarding coding exercises that test your understanding of concepts with Exercism.
Given a DNA strand, return its RNA Complement Transcription.
Convert a resistor band's color to its numeric representation
Clean up user-entered phone numbers so that they can be sent SMS messages.
No need to specify types, types are inferred by ReScript compiler and are guaranteed to be correct.
Like OCaml, ReScript is a functional programming language with pattern matching, variants and more.
ReScript compilation times are super fast which means fast iteration cycles.
Compiler guides you through all places that need to be fixed during refactor until it just works.
Every language has its own way of doing things. ReasonML is no different. Our mentors will help you learn to think like a ReasonML developer and how to write idiomatic code in ReasonML. Once you've solved an exercise, submit it to our volunteer team, and they'll give you hints, ideas, and feedback on how to make it feel more like what you'd normally see in ReasonML - they'll help you discover the things you don't know that you don't know.Learn more about mentoring
The ReasonML track on Exercism has 24 exercises to help you write better code. Discover new exercises as you progress and get engrossed in learning new concepts and improving the way you currently write.See all ReasonML exercises
The best part, it’s 100% free for everyone.