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# "Learning Functional Programming Through Multimedia"
Slashdot (03/16/04); Jones, Isaac
Haskell is a purely functional programming language and the book, "The
Haskell School of Expression: Learning Functional Programming Through
Multimedia," is a great introduction to the platform now being u
If I am writing a rener/parser for e.g. HTTP
Requests and Responses, I would like to be able to
guarantee that the parser really is the inverse of
the generator.
I assume that if I define a pair of computations
as reversible then I can put those computations in
some monad such that I can do:
pa
I think I just figured it out. Answering my own
question and asking another:
The property we want to fulfill is:
prop_reverse forward reverse thing = roundtrip thing == thing
where roundtrip = reverse . forward
Since a function is a value that produces a
computation (when evaluated) and a mo
Hi,
Does someone has the Haskell XML Toolbox, lets say working in Windows
environment?. I have tried install them in Hugs 98 for Windows but there are
Hexadecimal characters escape out of range.
One choice, I know, is go to LINUX.
I am working in CNC programming and I am in the begining of the
The problem with Runnable is that it is not ewasily implementable
for all monads... So purists rather than implement it for some don't
implement it at all.
Here's some examples:
class Runnable x y where
run :: x -> y
instance Runnable (m a) (m a) where
run = id
instance Runnable (s -> m
Implementing Reverse from before, I am running
into this weird error:
type ReverseType a string = (string ->(string,a))
data Reverse a string = Reverse (ReverseType a string)
instance Monad (Reverse a s) where
return x = Reverse (\text -> (text,x))
(Reverse p) >>= k = Revers
On 2004-03-23 at 16:58EST "S. Alexander Jacobson" wrote:
> Implementing Reverse from before, I am running
> into this weird error:
>
> type ReverseType a string = (string ->(string,a))
> data Reverse a string = Reverse (ReverseType a string)
>
> instance Monad (Reverse a s) where
> re
So if I want to use Monad, I have to have Reverse
only work with Strings and not some data type
that might be a String?
Is there a workaround that would allow me to
preserve flexibility around the target datatype?
Otherwise I'll rename Forward and Reverse to
toString and fromString, but the notio
