Ope meet Haskell

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Thu May 28 2020 22:12:31 GMT+0000 (Coordinated Universal Time)

-- instances of the Ord typeclass have the ordering operators defined.
-- i.e ==, /= , <= etc
-- Ord a is a context
qsort :: Ord a => [a] => [a]
qsort [] = []
qsort (x:rest) = [v | v <- rest, v <= x] ++ [x] ++ [v | v <- rest, v > x]

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#haskell #interesting #functionalprogramming #quicksort #elegantcode

Explaining Quicksort in Haskell line by line

quicksort :: Ord a => [a] -> [a] 
quicksort [] = [] 
quicksort (p:xs) = (quicksort lesser) ++ [p] ++ (quicksort greater) 
  where 
     lesser = filter (< p) xs 
     greater = filter (>= p) xs

#haskell

* -> *

data Maybe a = Nothing | Just a
data Either e a = Left e | Right a
data [a] = [] | a : [a]
newtype Identity a = Identity a
data Proxy a = Proxy
newtype Reader r a = Reader (r -> a))
newtype State s a = State (s -> (a, s))
newtype Parser a = Parser (String -> [(a,String)])
data IO a =  ¯\_(ツ)_/¯

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Ope meet Haskell

-- instances of the Ord typeclass have the ordering operators defined.
-- i.e ==, /= , <= etc
-- Ord a is a context
qsort :: Ord a => [a] => [a]
qsort [] = []
qsort (x:rest) = [v | v <- rest, v <= x] ++ [x] ++ [v | v <- rest, v > x]

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Ope meet Haskell

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