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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.
Ok, this was smart!
Think about the order in which the replace method is being called! How can you do it without switching back the things you have just switched? This one got me for ages. Great challenge.
Love it
AHH so we did not have to convert the array of strings into an array of numbers. D'oh.