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Boris Baskovec4,798 Points
What is @balance?
@balance is never used in the video (https://teamtreehouse.com/library/ruby-foundations/ruby-core/enumerable), balance is the method which returns a sum of all the operations in the transactions array, but the @balance is still 0 at the end, why is it even included?
David Moore13,916 Points
You are correct, it is not being used (so far as I can tell by skimming the vid). You could use @balance if you wanted to hold the current balance in a variable.
I should point out that while @balance and the method balance look alike (they have same name after all), they are in no way connected other than being part of the same class.