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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.
Isn't it for efficency? I assume that in a large project with mutiple one liners helps reduce the runtime of the program significantly and speed is key in any project. and its not like this is a very advance code, its very logical. I dont know the industry standard but this just my thoughts from a aspiring data scientist