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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.
That's because (in Ruby and many other languages) you can use an integer to get to the n-th charactetr in a String just as you can get the n-th element of an Array.
You can think of a String as an ordered list of charscters (technically code points, but thats another story).
why don't we need to turn em into arrays ?
lol