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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's generally not a great idea to force cast items. If you pass in an array of Array, this crashes.
Why concatenate when you have it converting to a String?
Camel case is your friend! This isnt web dev here, it's Swift! :)
THIS!!!!! I had to spend time looking up OLD and DEPRECATED code just to pass a Kata that didnt recoginze a map function on a String even though in Swift 4 in Playgrounds it would pass easily.
Because in an application use, an extention can be used globally without any issues or headaches. Simply call the exention function on any Int and you're done.