To practice recursion I try to make some functions of Data list
myself on the recursive way.
First I will try last.
So I did this :
-- | Main entry point to the application.
module Main where
-- | The main entry point.
last' :: [a] -> a
last' [] = []
last' (x:xs) = last xs
but now I see this error message :
src/Main.hs@6:12-6:14
Couldn't match expected type
a
with actual type
[t0]
a
is a rigid type variable bound by the type signature for
last' :: [a] -> a at
/home/app/isolation-runner-work/projects/112712/session.207/src/src/Main.hs:5:10
Relevant
bindings include last' :: [a] -> a (bound at
/home/app/isolation-runner-work/projects/112712/session.207/src/src/Main.hs:6:1) …
I my oponion I have said that the input is a array and the
output a string,
Roelof
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