On Mon, Sep 06, 2004 at 01:55:05PM +0100, Jon Harrop wrote:
> On Monday 06 September 2004 01:57, Richard Jones wrote:
> > One thing that worries me about laziness.
> >
> > Doesn't laziness often indicate a bug in the code?
>
> [...]
> 
> So laziness can be used as an optimisation.

Laziness has a particularly special place for pure languages like Haskell.
Some algorithms cannot be expressed with the same asymptotic complexity in
a pure eager language as in an impure eager language.  But this complexity
gap can be closed by making the pure language lazy:

    http://web.comlab.ox.ac.uk/oucl/work/geraint.jones/morehaste.html

cheers,
William

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