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- JavaScript
- Python
- Ruby
- Haskell
- COBOL (Beta)
- Java
- C
- Julia (Beta)
- λ Calculus (Beta)
- Lua
- C#
- CoffeeScript
- F#
- Elixir
- Swift
- Rust
- Shell
- Nim (Beta)
- OCaml (Beta)
- Crystal
- PHP
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- Scala
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- Reason (Beta)
- Elm (Beta)
- Clojure
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- Factor (Beta)
- Groovy
- R (Beta)
- Racket
- D (Beta)
Start training on this collection. Each time you skip or complete a kata you will be taken to the next kata in the series. Once you cycle through the items in the collection you will revert back to your normal training routine.