[Haskell-cafe] How is laziness defined?

[Andrew Wagner]

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 <tjay.dreaming at gmail.com> wrote:
> 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 that right? What else?
>
> This is one of the things that just boggles my mind everytime I try to
> wrap it around this thing called Haskell ;)
>
> Cheers,
>
> TJ
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