[squeak-dev] Re: Collection>>sum implementation
Paolo Bonzini
bonzini at gnu.org
Mon Aug 11 15:18:40 UTC 2008
>> Collection>>reduce: aBlock
>> ^ self allButFirst inject: self first into: aBlock
>>
>
> #allButFirst copies the whole collection, where in the current #sum
> implementation there is no such copy. we should avoid slowing down the
> method.
That's just an idea, the actual implementation would be
marker := value := Object new.
self do: [ :each |
value := marker == value ifTrue: [ each ]
ifFalse: [ aBlock value: value value: each ] ]
with an optimized implementation for SequenceableCollection.
Paolo
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