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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 doesn't seem like a very good idea to extend String for a very specific purpose like this
you needn't use an
ifblock for the return values, it would make your code more compact without sacrificing readability to simply return the condition, which itself is a boolean.