Thanks, this is working well.

But just for understanding

in the part acc x Nothing x is the input string,
and in the part _j means the same as (xs:x)

Roelof

Alex Hammel schreef op 10-11-2014 22:47:

It's an indentation issue. Make sure that there are no spaces before the bit about 'last5 = foldr acc' etc.

On Mon, Nov 10, 2014 at 12:48 PM, Roelof Wobben <r.wobben@home.nl> wrote:

Roelof Wobben schreef op 10-11-2014 20:59:

last5 :: [a] -> Maybe a
last5 = foldr acc Nothing where
acc x Nothing = Just x
acc _ j = j

When I enter this in GHCI I see this error :

Illegal type signature: ‘[a] -> Maybe a last5’

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