[Haskell-cafe] Newbie type question for wxHaskell learner
nick.straw at gmail.com
Fri Jan 7 23:45:36 CET 2011
Yes you're right I had brackets wrong (and the 'where' version is
easier to read), thanks.
I think the where style works best - or maybe flip and a dangling \x-
I maybe slow but I'm learning.
On Jan 7, 7:21 pm, Daniel Fischer <daniel.is.fisc... at googlemail.com>
> On Friday 07 January 2011 19:45:26, b1g3ar5 wrote:
> > Nearly - the first suggestion doesn't work because each es needs a new
> > panel I can't use the same one each time.
> > The second suggestion doesn't quite work because the x in [text :=
> > contents x] is not in scope of the \p function.
> Prelude Graphics.UI.WX> :t \w -> mapM (\x -> panel w  >>= \p -> textCtrl
> p [text := x])
> \w -> mapM (\x -> panel w  >>= \p -> textCtrl p [text := x])
> :: Window a -> [String] -> IO [TextCtrl ()]
> x is in scope as far as I can tell, the mapM'd lambda is
> mapM (\x -> (panel nb  >>= \p -> textCtrl p [text := contents x]))
> mapM foo my_list
> foo x = do
> p <- panel nb 
> textCtrl p [text := contents x]
> x is bound in a scope enclosing p's scope, so it is (or should be)
> What does the compiler say exactly?
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