[squeak-dev] Re: Generators in Smalltalk?
leves at elte.hu
Wed Feb 10 07:16:03 UTC 2010
On Tue, 9 Feb 2010, Andreas Raab wrote:
> Colin Putney wrote:
>> Also, Stephen Pair posted an implementation here in December:
> Brilliant! That's the ticket! Once I got down the right path it's even
> simpler than that. I put a version of Generator into the inbox for people to
> play with and give feedback. With 5 methods total you get to do fun stuff
> | gen max |
> max := 10000000.
> gen := Generator on:[:yield| Integer primesUpTo: max do: yield].
> 'Computing primes' displayProgressAt: Sensor cursorPoint
> from: 1 to: max during:[:bar| | prime |
> [prime := gen next] whileNotNil:[bar value: prime].
> I think we should add support for Generators. They are so incredibly useful
> where you have complex operations that you don't want to spend the upfront
> effort on to compute everything (like primes) before you can do some work
> with the results.
I wonder how can you use generators to generate primes efficiently _and_
on the fly.
> - Andreas
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