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How concepts work

codecrafters

Introduction

Learn how to solve CodeCrafters challenges in Go

Learn how to solve CodeCrafters challenges in Java

Java

Learn how to solve CodeCrafters challenges in Kotlin

Kotlin

Learn how to solve CodeCrafters challenges in Zig

Running into test failures that are hard to debug? Try these steps.

How do I debug test failures?

Can I install additional dependencies?

Yes, you can! Use the dropdown on the top-right to do this:

Can I re-attempt a challenge in a different language?

How do I debug test failures in the Redis Challenge?

In CodeCrafters challenges, you'll write code to pass each stage and we'll verify your code submissions. Read more below to understand how exactly this works.

How do challenges work?

How do I install the CLI?

How do I update the CLI?

How do I use the CLI?

How do I get an invoice?

How do I get access the Discord server?

Get paid for introducing a high-quality learning resource to your community.

How do I become a CodeCrafters Partner?

If you've completed one or more challenges, you'll find your profile page at https://codecrafters.io/users/<your_github_username>.

Where is my profile page?

Can I list multiple languages on my profile page?

Instructions on deleting your CodeCrafters account

How do I delete my account?

Learn about how you can help us build CodeCrafters

Learn about how you can help us add language support

Learn about how to create starter code for a language

Starter Code

Learn about how to create a Dockerfile for a language

Dockerfile

Learn about how to structure a test runner image for the CodeCrafters test runner

Test Runner Image Interface

The following tips should help you build a great CodeCrafters challenge.

Planning your challenge

Pre-launching your challenge

Details on building the stage instructions and test cases for your challenge.

Building your challenge

Schema for the course-definition.yml file.

Course Definition Reference

Learn about what Concepts are, and how to create them.

The following tips should help you choose what concepts to build.

Contributors

Adding Language Support

Authoring Challenges

Authoring Concepts

How concepts work