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- JavaScript
- CoffeeScript
- Ruby
- Python
- C++
- C
- Julia (Beta)
- Swift
- Java
- C#
- F#
- COBOL (Beta)
- Scala
- Haskell
- Clojure
- PHP
- Crystal
- TypeScript
- Rust
- Go
- Shell
- R (Beta)
- OCaml (Beta)
- Kotlin
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- Racket
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- Dart
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- Lua
- Perl (Beta)
- Elm (Beta)
- D (Beta)
- Elixir
- Factor (Beta)
- Groovy
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.