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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.
Having problem in F# - solution which passes tests using type checking gives this error with the real attempt: /home/codewarrior/program.fsx(37,55): error FS0001: The type 'int' does not match the type 'Object'
Made it shorter (which judging by the upvotes on Codewars, must mean better!)