I am happy for all the disagreeing posts and that HN is a place for it. It also helps me understand my colleagues. It may be how our brains are wired. For me

I am happy for all the disagreeing posts and that HN is a place for it. It also helps me understand my colleagues. It may be how our brains are wired. For me whenever I see a for loop I see bugs. It is also about that you get the concurrency from map/reduce-type jobs for free without having to think about it. But yeah there are a couple of places you need to be careful. Avoiding duplicates and handling of NULL.