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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.
The 3rd return line will never get hit.
Did you actually read that post? They show that it hardly matters for 100,000 iterations, and we already know this only needs to handle 2 strings.
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Test.assertEquals(validParentheses( "()))" ), false);
Should be added, otherwise this logic passes submission:
first == '(' && last == ')' && length is even