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Indeed, but I've found in certain challenges the zero needs to be there or the reduce doesn't work properly. I haven't quite wrapped my head around what causes that so I've probably developed a habit of putting it in every time just to be explicit.
A Very Big Sum
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Just a small note. You can skip the last param for reduce():
Indeed, but I've found in certain challenges the zero needs to be there or the reduce doesn't work properly. I haven't quite wrapped my head around what causes that so I've probably developed a habit of putting it in every time just to be explicit.