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This is an amazing effort, implementing ApplicativeDo and using Haxl for automatic batching and concurrency, doing code hot-swap in a compiled language, develop

• spopejoy 11y ago
  It's definitely not just a "We're really happy with Haskell here at FB" post. This probably explains the trollish comments elsewhere to the tune of "Haskell without Simon+bos /= scalable". It is a little intimidating, though. I think the perception is "Haskell is hard enough, AND I have to be a C++/GHC internals expert too?" The hard truth is you have to be this level of expert at something to achieve robustness at industrial scale. Simon's comment in this thread hints at some of the power of Haskell alone: The "automatic" bit is that we insert the code that consults the map so the programmer doesn't have to write it. The map itself is already invisible, because it's inside the monad. So the overall effect is a form of automatic memoization.[1] This pretty much sums up appdev in Haskell. Engineer (or employ) amazing abstractions with no funny business (hello Spring!) and no loss in safety or expressiveness. I'm really happy this team exists, this is the kind of work that will take Haskell into the mainstream. Kudos! [1] https://news.ycombinator.com/item?id=9787523 https://news.ycombinator.com/item?id=9787523