Added Haskell version #4
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Haskell implementation. This showcases a couple of GHC features, in particular I do not believe there is a standard way to delay (there is however a read with timeout). A fully standard compliant program without the delay can be accomplished by removing four lines: the shebang, the NumericUnderscores extension, and the references to threadDelay. All types were left for the compiler to infer. There's only one choice, the type for the countdown.
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Haskell implementation. This showcases a couple of GHC features, in particular I do not believe there is a standard way to delay (there is however a read with timeout).
A fully standard compliant program without the delay can be accomplished by removing four lines: the shebang, the NumericUnderscores extension, and the references to threadDelay.
All types were left for the compiler to infer. There's only one choice, the type for the countdown.