Want to learn and master Wren?

Join Exercism’s Wren Track for access to 91 exercises with automatic analysis of your code and personal mentoring, all 100% free.

Explore exercises

About Wren

class Wren {
  flyTo(city) {
    System.print("Flying to %(city)")

Key Features of Wren



Wren uses a familiar, modern syntax familiar to many coming from JS or another C-like language.


Wren's VM implementation is under 4,000 semicolons of readable and lovingly commented C code.


A single-pass compiler, tight byte-code, and compact objects keeps Wren fast on it's feet.


Lightweight fibers let you organize your program into a flock of communicating coroutines.


Easily embedded, no dependencies, a small standard lib, and easy-to-use C API.


Many scripting languages lack (or have unusual) object models. Wren places classes front and center.

Get mentored the Wren way

Every language has its own way of doing things. Wren is no different. Our mentors will help you learn to think like a Wren developer and how to write idiomatic code in Wren. 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 Wren - they'll help you discover the things you don't know that you don't know.

Learn more about mentoring

Community-sourced Wren exercises

The Wren track on Exercism has 91 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 Wren exercises

Get started with the Wren track

The best part, it’s 100% free for everyone.