Am Dienstag 01 Dezember 2009 10:32:24 schrieb newbie2009:
> leledumbo wrote:
> > None of them are legal, at least in my WinHugs they're not. What tools
> > are you using?
>
> 1) I am using GHCi. I put the following into a file named composition.hs
> and typed ":l composition.hs" in GHCi. I also did
leledumbo wrote:
>
> None of them are legal, at least in my WinHugs they're not. What tools are
> you using?
>
1) I am using GHCi. I put the following into a file named composition.hs and
typed ":l composition.hs" in GHCi. I also did a ":browse Main"
2) Next, I installed WinHugs, and loaded th
> I dont understand why the above functions are legal, and what arguments
they need. Could you please
> give an example of how to invoke it?
Huh? None of them are legal, at least in my WinHugs they're not. What tools
are you using?
Some good reading I found:
http://learnyouahaskell.com/higher-or
I am a newbie. Consider this code:
square x = x * x
add3 x y z = x + y + z
leledumbo wrote:
>
>
> what about (square . add3) 1 2?
>
> It doesn't work since add3, when curried (arguments of square "blended"
> with add3's) with 1 argument becomes:
>
> add3 :: Num a => a -> a -> a
>
> whic
> This doesnt. But why?
Back to the definition of function composition: f . g is possible if g
returns a value that's compatible with f's argument. Now, let's check the
type of square and add3:
square :: Num a => a -> a
add3 :: Num a => a -> a -> a -> a
(square . add3 1 2) is actually seen by t
newbie2009 wrote:
>
> I am a newbie. Consider this code:
>
> square x = x * x
> add3 x y z = x + y + z
> add x y = x + y
> composition5 x = (square . add3) x
> composition6 x y = (square . add3) x y
>
> 1) What arguments can i pass to composition5? Please give an example of
> calling it.
> 2
