or actually just...
hartthoma@linuxpt:~>cat test.hs
import Debug.Trace
foo = foldl (\first second ->
trace ( ( show first) ++ ("+") ++ (show second ) )
( first + second) ) 0 [1,2,3]
hartthoma@linuxpt:~>ghc -e foo test.hs
0+1
1+2
3+3
6
hartthoma@linuxpt:~>
is probably better
Thomas Hartman
Sent by: haskell-cafe-bounces@haskell.org
08/17/2007 10:52 AM
To
haskell-cafe@haskell.org, iand675@gmail.com
cc
Subject
Re: [Haskell-cafe] Looking at program execution
hartthoma@linuxpt:~>cat test.hs
import Debug.Trace
foo = foldl (\first second ->
(trace ( "first: " ++ ( show first) ) first)
+
(trace ( "second: " ++ (show second) ) second) ) 0 [1,2,3]
bar = foldl (+)
traceIt x = trace ("\nTraceIt:\n"++show x++"\n") x
hartthoma@linuxpt:~>ghc -e foo test.hs
first: 0
second: 1
first: 1
second: 2
first: 3
second: 3
6
hartthoma@linuxpt:~>
hope this helps.
Ian Duncan
Sent by: haskell-cafe-bounces@haskell.org
08/16/2007 08:20 PM
To
haskell-cafe@haskell.org
cc
Subject
[Haskell-cafe] Looking at program execution
Is there any way to view the steps that a haskell program goes
through step by step?
I'm thinking something similar to what I've seen in things I've been
reading. For example:
foldl (+) 0 [1..10]
=> (0+1)
=> ((0+1)+2)
=> (((0+1)+2)+3)
=> etc.
I've seen these sorts of line-by-line execution steps, but I was
curious if there was any way to simply type in a function and its
arguments and have ghci or hugs or something print out this sort of
visual representation of what's going on. Anyone know of something
like this?
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