On 05/02/07, TJ [EMAIL PROTECTED] wrote:
I went through the entry on laziness on the wikipedia wikibook. Very
nice. The wikibook sure has grown a lot since I last visited.
http://en.wikibooks.org/wiki/Haskell/Laziness
Great! I was about to suggest this! This is one of our
G'day all.
Quoting Matthew Brecknell [EMAIL PROTECTED]:
Although it covers irrefutable (lazy) pattern matching in the second
section, it does appear to miss the point that let bindings are always
irrefutable.
Thus, there is no difference between these two:
let (x,y) = foo in ...
let
I said:
Although it covers irrefutable (lazy) pattern matching in the second
section, it does appear to miss the point that let bindings are always
irrefutable.
Thus, there is no difference between these two:
let (x,y) = foo in ...
let ~(x,y) = foo in ...
Andrew Bromage said:
let (x,())
G'day all.
Quoting Matthew Brecknell [EMAIL PROTECTED]:
In other words, the irrefutability of a pattern match does not
distribute inside the top-level data constructor of the pattern.
I wasn't disagreeing with you, which is why I didn't comment.
Note also that if Haskell prime incorporates
I would think that with 100% laziness, nothing would happen until the
Haskell program needed to output data to, e.g. the console. Quite
obviously that's not it. So how is laziness defined in Haskell?
I remember vaguely someone saying that pattern matching on a value
forces it to be evaluated. Is
G'day all.
Quoting TJ [EMAIL PROTECTED]:
I would think that with 100% laziness, nothing would happen until the
Haskell program needed to output data to, e.g. the console. Quite
obviously that's not it. So how is laziness defined in Haskell?
It means that the program behaves as if things are
I found it useful to work through an example where lazy evaluation was
important, and wrote it up in a tutorial. It may or may not help you,
no guarantees, but here it is:
http://www.haskell.org/haskellwiki/Haskell/Lazy_Evaluation
Any comments are welcome!
Andrew
On 2/4/07, TJ [EMAIL PROTECTED]
On 2/5/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
Quoting TJ [EMAIL PROTECTED]:
I would think that with 100% laziness, nothing would happen until the
Haskell program needed to output data to, e.g. the console. Quite
obviously that's not it. So how is laziness defined in Haskell?
It
I would think that with 100% laziness, nothing would happen until the
Haskell program needed to output data to, e.g. the console.
In many cases, that's exactly what it's like.
Quite obviously that's not it. So how is laziness defined in Haskell?
In fact, Haskell is not defined as lazy, it
tjay.dreaming:
On 2/5/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
Quoting TJ [EMAIL PROTECTED]:
I would think that with 100% laziness, nothing would happen until the
Haskell program needed to output data to, e.g. the console. Quite
obviously that's not it. So how is laziness defined
G'day all.
tjay.dreaming:
So it's just IO which makes things run huh? OK that's basically what I
said there. Cool.
Yeah, but you said output. Sending a signal to another process in
Unix is I/O, which would force the process id to be evaluated, but
there's no output as such.
Cheers,
Andrew
I went through the entry on laziness on the wikipedia wikibook. Very
nice. The wikibook sure has grown a lot since I last visited.
http://en.wikibooks.org/wiki/Haskell/Laziness
I believe I've got it now. By it I mean the understanding of laziness
in Haskell. Even though Haskell is, strictly
TJ said:
I went through the entry on laziness on the wikipedia wikibook. Very
nice. The wikibook sure has grown a lot since I last visited.
http://en.wikibooks.org/wiki/Haskell/Laziness
Thanks for the link. I hadn't seen that before.
Although it covers irrefutable (lazy) pattern matching in
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