Hi Max!
This is a type definiton, which says that parsing takes one argument, a
String, and gives you back a list of OpTree:
parsing :: String-[OpTree]
This is a function definition. The part before the = is called the
left hand side, while the part after the = is called the right hand
At 13:12 14/12/03 +0100, Max Hoffmann wrote:
Dear Haskell cafe members,
I am somebody one could well call a bloody beginner but the elegance of
functional programming and am therefore truly interested to learn more about
Haskell.
Now I have an assignment to write a parsing function to convert a
I apologize... my question was unclear.
It was not the standard MonadPlus class and functions that I was asking
about, but the specific instance for Maybe (i.e. or_maybe). As it happens,
a couple of times in the past couple of weeks, I might have used such a
function if it were available in
On Mon, Dec 15, 2003 at 08:55:10AM +, Graham Klyne wrote:
I apologize... my question was unclear.
It was not the standard MonadPlus class and functions that I was asking
about, but the specific instance for Maybe (i.e. or_maybe). As it happens,
a couple of times in the past couple of
Graham == Graham Klyne [EMAIL PROTECTED] writes:
Graham I apologize... my question was unclear. It was not the
Graham standard MonadPlus class and functions that I was asking
Graham about, but the specific instance for Maybe (i.e. or_maybe).
Graham As it happens, a couple of times in the past
David == David Roundy [EMAIL PROTECTED] writes:
David My or_maybe is just defined as
David or_maybe (Just e) _ = Just e or_maybe Nothing f = f
David which is pretty simple, so you can run a series of calculations
David (assuming you want to keep the first that has a non-Nothing
David result)
Hi
David Roundy wrote:
On Mon, Dec 15, 2003 at 08:55:10AM +, Graham Klyne wrote:
I apologize... my question was unclear.
It was not the standard MonadPlus class and functions that I was asking
about, but the specific instance for Maybe (i.e. or_maybe). As it happens,
a couple of
Conor McBride [EMAIL PROTECTED] wrote:
snip
I've always been a little bothered by the MonadPlus class: zero and
plus are associated (no pun intended) in my mind with monoidal
structure. Is there more to MonadPlus than a clumsy workaround for
the lack of quantified constraints?
Yes. For
