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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.
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The ternary operator can be thought of as shorthand for an "if else" statement.
So it would handle the a.length() == b.length() case the same way an if statement would. That is, if a.length() == b.length() then the condition would fail (because a is not less than b) and the second statement would be triggered (the one after the colon:).
I've never seen this "ternary" thing yet. I'm wonder, how does this case handle the a.length()==b.length() case?