Codewars

Codewars is a practice site where developers solve short coding challenges called kata. Each kata is ranked by difficulty, and you can solve it in many programming languages.

You write a solution in the browser and run it against test cases. The results show where the code fails, so you can fix it and try again. After a kata is complete, you can compare your solution with others. Community members also write their own kata, which lets people share techniques and interview questions. The goal is to build skill through regular practice with peers.

• Kata ranked from beginner to expert
• Test cases check your code in the browser
• Compare your solution with other solutions
• Write and publish your own kata
• Practice in more than 55 languages

Codewars suits developers who want to sharpen their skills in a language they already use. It also helps students and job seekers who practise interview style problems.

Codewars is free to join and use, and it has pages for educators and companies. Solving kata happens in the browser, so you can start without installing anything. The site also has pages for educators and companies that want to run training, which may suit classes or teams.