On 6 Feb 2008, at 11:32 PM, Uwe Hollerbach wrote:
All right, after a bit of dinner and some time to mess about, here's
another attempt to check my understanding: here is a simplified
version of the lisp-time example:
module Main where
import System.Time
pure_fn :: Integer - String
pure_fn n
On 2/6/08, Uwe Hollerbach [EMAIL PROTECTED] wrote:
And, coming back to my scheme interpreter, this is at least somewhat
irrelevant, because, since I am in a REPL of my own devising, I'm
firmly in IO-monad-land, now and forever.
This is not entirely true; a REPL can be pure.
Consider the
Thanks, I'm going to have to study this a bit...
Uwe
On 2/7/08, Ryan Ingram [EMAIL PROTECTED] wrote:
On 2/6/08, Uwe Hollerbach [EMAIL PROTECTED] wrote:
And, coming back to my scheme interpreter, this is at least somewhat
irrelevant, because, since I am in a REPL of my own devising, I'm
Uwe Hollerbach wrote:
lispUTCTime [] = doIOAction (getClockTime) toS allErrs
where toS val = String (calendarTimeToString (toUTCTime val))
here you use liftIO (hidden in doIOAction) to use an IO action
(getClockTime) inside of a different monad wich contains IO at it's
base. so your custom
Hello Uwe,
Wednesday, February 6, 2008, 7:44:27 AM, you wrote:
But after that, it sure seems to me as if I've taken data out of the
IO monad...
this means that you can't use results of IO actions in pure functions.
your code works in some transformed version of IO monad, so you don't
escaped
Hi, all, thanks for the responses. I understand the distinction
between pure functions and impure functions/procedures/IO actions, it
just felt to me in the samples that I quoted that I was in fact
starting from basically the starting point, eventually getting to the
same endpoint (or at least a
On 6 Feb 2008, at 7:30 PM, Uwe Hollerbach wrote:
Hi, all, thanks for the responses. I understand the distinction
between pure functions and impure functions/procedures/IO actions,
Um, I'm not sure of that, given what you go on to say.
it
just felt to me in the samples that I quoted that I
Well, you may well be right! Just think of me as a planarian at the opera... :-)
On 2/6/08, Jonathan Cast [EMAIL PROTECTED] wrote:
On 6 Feb 2008, at 7:30 PM, Uwe Hollerbach wrote:
Hi, all, thanks for the responses. I understand the distinction
between pure functions and impure
All right, after a bit of dinner and some time to mess about, here's
another attempt to check my understanding: here is a simplified
version of the lisp-time example:
module Main where
import System.Time
pure_fn :: Integer - String
pure_fn n = calendarTimeToString (toUTCTime (TOD n 0))
On Feb 7, 2008 7:32 AM, Uwe Hollerbach [EMAIL PROTECTED] wrote:
pure_fn :: Integer - String
pure_fn n = calendarTimeToString (toUTCTime (TOD n 0))
make_wicked :: String - IO String
make_wicked str = return str
-- use of make_wicked
main = (make_wicked (pure_fn 1234567890)) =
Hello, haskellers, I have a question for you about the IO monad. On
one level, I seem to be getting it, at least I seem to be writing
code that does what I want, but on another level I am almost certainly
not at all clear on some concepts. In various tutorials around the
web, I keep finding this
On Feb 5, 2008 9:44 PM, Uwe Hollerbach [EMAIL PROTECTED] wrote:
lisp (UTCtime)
Wed Feb 6 03:57:45 UTC 2008
---
lisp (UTCtime 1.203e9)
Thu Feb 14 14:40:00 UTC 2008
--
But after that, it sure seems to me as if I've taken data out of the
IO monad... haven't I? Given that the second
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