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99 questions/Solutions/4

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(*) Find the number of elements of a list.

myLength           :: [a] -> Int
myLength []        =  0
myLength (_:xs)    =  1 + myLength xs
myLength'  =  foldr (\_ n -> n + 1) 0
myLength'' =  foldr (\n _ -> n + 1) 0
This is
length
in
Prelude
.