On Thu, Aug 20, 2009 at 2:52 AM, Jules Bean <jules@jellybean.co.uk> wrote:
Peter Verswyvelen wrote:
Not at all, use it for whatever you want to :-)

I'm writing this code because I'm preparing to write a bunch of tutorials on FRP, and I first wanted to start with simple console based FRP, e.g. making a little text adventure game, where the input/choices of the user might be parsed ala parsec, using monadic style, applicative style, and arrows, and then doing the same with FRP frameworks like


This is a really bad place to start a FRP tutorial IMO.

The interface for 'interact' does not make any promises about the relative evaluation order of the input list / production order of the output list.

That's why you are having to play horrible tricks with seq to try to force the order to be what you want.

I don't think this is the basis of a robust system or a sensible tutorial.

Just my 2c.

Interesting feedback, but I don't get the reason really.  How is using seq a "horrible trick"?  It's there for strict evaluation when you need it, and in this case it was warranted.

And as far as saying it's not a good basis for a robust system, I'm also not sure I agree, but a "sensible tutorial", that I could believe as I think it's actually quite difficult to explain these topics to people in a way they're going to understand right away.  

Could we perhaps bother you to suggest an alternative along with your criticism?  It would feel a little more constructive at least (not that I think you were being terribly harsh)

Dave