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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.
it is short but very suboptimal unfortunately - this forces unnecessary calcualtion of square number... if the array is large then it is very inefficient. Manual squre is the way as it allows to return false if the first one or any is false, rather than doing all the calculations beforehand.
Linq is indeed a very effective technology