Sebastien Carlier wrote:
import Monad
...
do y - liftM unzip m1
Thanks.
I'm constantly amazed by the number of tricks one has
to know before he can write concise code using the
do-notation (among other things, I used to write
"x - return $ m" instead of "let x = m").
[snip]
I am finding functional dependencies confusing. (I suspect I am not alone.)
Should the following code work?
class HasConverter a b | a - b where
convert :: a - b
instance (HasConverter a b,Show b) = Show a where
show value = show (convert value)
Mon, 8 Jan 2001 17:53:35 +1300, Tom Pledger [EMAIL PROTECTED] pisze:
Having types with type variables which are never instantiated nor
constrained should be equivalent to having ground types!
Do you have any examples of such a type variable in an instance decl?
Not quite. When the type
George Russell writes:
I am finding functional dependencies confusing. (I suspect I am not alone.)
Should the following code work?
class HasConverter a b | a - b where
convert :: a - b
instance (HasConverter a b,Show b) = Show a where
show value = show (convert value)
Marcin 'Qrczak' Kowalczyk writes:
[...]
My new record scheme proposal does not provide such lightweight
extensibility, but fields can be added and deleted in a controlled
way if the right types and instances are made.
Johan Nordlander must be on holiday or something, so I'll deputise for
Inspired by the recent discussions of what kinds of books would
encourage the spread of Haskell, I whipped up a draft table of contents
for "Haskell in a Nutshell."
You can find it in PDF form at
http://nellardo.com/lang/haskell/hianTOC.pdf (it should have the fonts
embedded - OReilly uses a
Brook Conner [EMAIL PROTECTED] wrote,
You can find it in PDF form at
http://nellardo.com/lang/haskell/hianTOC.pdf (it should have the fonts
embedded - OReilly uses a couple of oddballs) and in ASCII text at
http://nellardo.com/lang/haskell/haskell-in-a-nutshellTOC.txt.
Makes sense to me.
Yes! I agree with Manuel about the IO. It looks bad being towards
the end.
Regards,
Bill Halchin
From: "Manuel M. T. Chakravarty" [EMAIL PROTECTED]
Reply-To: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
CC: [EMAIL PROTECTED]
Subject: Re: ANNOUNCE: Draft TOC of Haskell in a Nutshell
Date: Tue, 09
Brook Conner [EMAIL PROTECTED] writes:
Inspired by the recent discussions of what kinds of books would encourage the
spread of Haskell, I whipped up a draft table of contents for "Haskell in a
Nutshell."
Let's see. It all depends on what you put into the chapters, of
course, but you seem to
However, I would move IO further to the front.
For any "real life" programming, IO is essential...
I am currently teaching a Functional Programming lecture (notes in German:
http://www.informatik.uni-leipzig.de/~joe/edu/ws00/praxis/skript/)
and I also used this approach: use the
On Fri, 5 Jan 2001 10:26:19 -0500 (EST)
Patrick M Doane [EMAIL PROTECTED] wrote:
[snip]
I think a really good beginner's tutorial on I/O could be
started from this
paper:
- Start immediately with using the 'do expression' and
don't
worry about the history that led to its
Erik Meijer wrote:
Nope, I also think that Haskell is the world's finest *imperative* language
(and the world's best functional language as well). The beauty of monads is
that you can encapsulate imperative actions as first class values, ie they
have the same status as functions, lists, ...
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