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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.
instead of inject, you could use
#sumwhich also more elegantly handles the 0 case, meaning you can skip the|| 0checkThat test returns false, as expected. The test above it tests for parens = "", which is expected to be true. It’s just an edge case that we can’t log because it’s an empty string.