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onosendi/foldl.hs

Created July 30, 2022 19:30
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foldl.hs
-- Eta reduce Found: foo2 xs = foldl (\ x acc -> acc + 1) 0 xs Why not: foo2 = foldl (\ x acc -> acc + 1) 0
length1 xs = foldl (\x acc -> acc + 1) 0 xs
-- Ambiguous type variable ‘t0’ arising from a use of ‘foldl’ revents the constraint ‘(Foldable t0)’ from being solved.
length2 = foldl (\x acc -> acc + 1) 0
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