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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.
c# version i have a error.
my code runned correctly in visual studio.
int[]' does not contain a definition for 'GroupBy' and no accessible extension method 'GroupBy' accepting a first argument of type 'int[]' could be found (are you missing a using directive or an assembly reference?)
what am I missing ?