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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.
This one has constant comlexity O(1), while an iterator will have at least linear complexity O(n).
While this doesn't make this automatically more efficient for small values, we can optimise this solution by using bit operation for deviding but the compiler already does that for us.
So that means this solutuon needs 4 arthmic operations to execute, while the iterator solution needs at least n arethmic operations, meaning that if n is bigger than 4 the iterator solution is already worse.
I feel this one more performant for very large n, under the assumption that sum() function for iterators goes through n elements.