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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.
Can't believe I forgot do while... doh! Love the solution starting at -1 count too.
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That was my first thought, always look for the quick return if no computation is required.
Nice, I like it! I did similar, except I used unshift instead of push, to avoid the reverse at the end. Also don't need any arguments on join, as '' is the default for that method.