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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.
CoffeeScript translation
Incrementation by negative values? A bit confusing, don't you think?
Why are you passing in a string? Everyone is doing .split(" "), and this breaks for empty string, which does not resolve to empty array.
Why not simply pass in an array?