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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.
Why "return someCondition ? true : false" and not just "return someCondition"?
I agree. I interpret "you don't have to worry with strings with less than two characters" to mean "if a string has less than two characters, do not modify it." This understanding implies that you must ensure that you do not modify strings if they contain only one character, which requires a check. If they meant "all strings passed in will have at least 2 characters," they should have said that.