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The parent did say they rolled their own map/reduce. It might not have been exactly as one would expect it to work in that case.

But yeah, map/reduce are so common nowadays that I think most people would not have a problem with them anymore. Even Java is doing them now :)

OTOH, if you've never encountered them because you come from languages that did not have them, they might be confusing at first. Some of my colleagues did have trouble getting used to map/reduce when Java8 came around.

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