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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.
I totally agree with you. This is where the work is done in an array within an array. I saw a great solution here via replace and regExp
Not all nested loops are inherintly O(n^2). And it is a case here as I explained here
Who the h..l selected current solution as "Best practice" ? Does anybody measures execution time of the functions in here and resources usage ?
or even READABILITY. Give me a break .