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  1. data MyList a = Nil | Cons a (MyList a) deriving (Eq,Ord,Show,Read)
  2.  
  3. range n m |n == m = Cons m Nil
  4. range n m = Cons n (range (n + 1) m)
  5.  
  6. myfoldl _ v Nil = v
  7. myfoldl f v (Cons x xs) = myfoldl f (f v x) xs
  8.  
  9. myreverse = myfoldl (\ys x -> Cons x ys) Nil
  10.  
  11. myhead (Cons x _) = x
  12.  
  13. main = print (myhead (myreverse (range 1 1000000)))
Success #stdin #stdout 0.27s 32384KB
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Standard input is empty
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1000000
https://ideone.com/15yhM
language:
Haskell (ghc 8.4.4)
created:
12 years ago
visibility:
public

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