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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.
This comment is hidden because it contains spoiler information about the solution
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very clever but if "[(a)]" does not work?
Using
whileisn't necessary, nor is mutating the input. You can count the number of opening brackets (or closing brackets, if you prefer). If you executesubthat many times then either the string will be empty or there will be an unmatched bracket. You shouldn't usewhilewhen the number of iterations is knowable.I like this! Though I'd suggest not mutating the input.