Re: [Haskell-beginners] Are these soloutions all valid and a good use of Haskell

_ just means "ignore this parameter, I'm not going to use it" On Tuesday, November 11, 2014, Roelof Wobben wrote:

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 javascript:_e(%7B%7D,'cvml','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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