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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.
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I mean, traffic lights are human made gadgets so "in real life" lights go as whatever way you design them to go.
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I know this also solves the problem but the requirements were as "constructors should take 3 arguments" for both shark and cat so I wouldn't do like this.
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it is called prefix increment