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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.
It worked for me in JavaScript.
This comment is hidden because it contains spoiler information about the solution
had to come back to this one several times throughout the day, very satisfying to pass all tests finally :)
my solution was not most efficient but it's great to see how others made it so
absolutely beautiful
took me 24 lines to get what you got in 2, very impressive!