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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
You've done snake case, not camel case.
Is
double_every_otherpreferred overdoubleEveryOtherin Ruby?Make the sample tests work.
Haskell already has a function for splitting strings into words like you did in, splitOn. This function is called words and does exactly the same as your function does.