[squeak-dev] Re: Generators in Smalltalk?
andreas.raab at gmx.de
Wed Feb 10 07:03:21 UTC 2010
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 like:
| 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.
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