[Haskell-beginners] problem with type

[Morel Pisum]

What you want is probably

checkNode :: String -> [String] -> Bool
checkNode s nodes = and (map (==s) nodes)

which returns True iff all nodes equal s.


> Am a bit stuck here,... please, what is wrong with this?
>
> checkNode :: String -> [String] -> Bool
> checkNode s nodes =
>    [s == node | node <- nodes ]
>
>
> src/me.hs:3:4:
>     Couldn't match expected type `Bool' with actual type `[t0]'
> [1 of 1] Compiling Main             ( src/me.hs, interpreted )
>     In the expression: [s == node | node <- nodes]
> Failed, modules loaded: none.
>     In an equation for `checkNode':
>         checkNode s nodes = [s == node | node <- nodes]
>
> thanks,
> Miro