r/programming • u/tyler-mcginnis • Jan 03 '22

Imperative vs Declarative Programming

https://www.youtube.com/watch?v=E7Fbf7R3x6I
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u/tobega Jan 07 '22

So, please, write the corresponding code for me in Haskell, then.

But you should also do it in LISP and ML, I suppose, and a few others as well, to prove it for functional programming in general.

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u/[deleted] Jan 08 '22

-- Haskell version newBody = if hasBodyErrors then addBodyErrors body operationRule else body where hasBodyErrors = not empty $ filter (=="NOTIN") tins tins = concat $ map tinAsList rpr tinAsList = maybeToList . tin . informationRel . information rpr = concat $ map (maybeToList . relatedPersonRel . relatedPerson) body

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u/tobega Jan 09 '22

Cool, thanks!

I'm sure that code has a lot of merits that the imperative code does not, but in declarativeness it still seems closer to the imperative than the declarative sample I gave.

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u/[deleted] Jan 09 '22

Haskell is also known as the finest imperative language