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It's more about the concepts, IMHO. Google has implemented MapReduce in C++. Which is probably why they're dominating the world while I'm playing with another language I'll never get to write anything in...

First it was in Python, now in C++. The change was for speed reasons, not because they didn't like functional languages. It is simply that functional languages don't quite meet the speed requirement that Google needs. And yes, I know that Haskell can compile some extremely fast code, but it still has not insignificant issues with memory bloat.

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