Haskell in Production

Re:Haskell in Production by nightski on Friday October 18, 2019 @02:42PM (#21293990)

Not really. You can mix them in Haskell too. Think of F# as Haskell except you are always working in the IO monad. Haskell doesn't require a "new way of writing IO code" at all. It just allows you to separate out the IO from the pure in a way that can be enforced by the compiler. But there is nothing preventing you from writing all Haskell code in the IO monad if you were so inclined - which is essentially OCaml/F#.

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Re:Haskell in Production by tome on Friday October 18, 2019 @03:52PM (#21294551)

> Not really. You can mix them in Haskell too.

True, but it's not particularly syntactically convenient.

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Re:Haskell in Production by nightski on Friday October 18, 2019 @04:49PM (#21294961)

The entire point of monadic (do) syntax in Haskell is to make this convenient. I'm not following you exactly.

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Re:Haskell in Production by tome on Saturday October 19, 2019 @02:36PM (#21299981)

runeks mentioned

    print “Enter name:”
    print (“Hello “ ++ readStdinLine ++ “!”)

which can't be written like that with do notation. It's also pretty confusing code to write in any language, so maybe that's not a problem.

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Re:Haskell in Production by nightski on Sunday October 20, 2019 @10:34AM (#21304394)

True, do notation does require you to add a line -

  main = do
      print "Enter name:"
      name <- getLine
      print ("Hello " ++ name ++ "!")

But I only said that it makes this convenient not that it allowed you to write any statement you want. It still makes it easy to intersperse pure and non-pure code.

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