[Haskell-cafe] Re: how do you debug programs?

Lennart Augustsson lennart at augustsson.net
Wed Sep 6 08:44:03 EDT 2006

So it sounds like what you need at the moment is more of a Haskell  
pretty printer than a debugger. :)
IDEs, like Visual Studio, can be very helpful when writing code in a  
language you don't really know, I've noticed this writing VBA.  I  
wish Visual Haskell were ready for real use.

	-- Lennart

On Sep 6, 2006, at 08:13 , Tamas K Papp wrote:

> On Wed, Sep 06, 2006 at 06:33:32AM -0400, Lennart Augustsson wrote:
>> I've also used Visual Studio, and I wouldn't mind having something
>> like that for Haskell.  But I have to agree with Jon, I think the
>> best way of debugging is to understand your code.  I think people who
>> come from imperative programming come with a mind set that you
>> understand your code by stepping through it in the debugger.  But I
>> find this paradigm much less useful for functional code.
> At this point, I need debugging not because I don't understand my
> code, but because I don't understand Haskell ;-) Most of the mistakes
> I make are related to indentation, precedence (need to remember that
> function application binds tightly).  The compiler and the type system
> catches some mistakes, but a few remain.
> Thanks for the suggestions.
> Tamas
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