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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.
Simply try to run recrusive method million times and run also this method million times comparing execution times in milliseconds, then you will see the answer why not recruisive ;)