Oh! Cool. :)
Well then the only proposition I have is adding it to the abstract collection class as iterating over combinations is not specific to a sequenceable collection. Or am I missing something here?
________________________________ Von: squeak-dev-bounces@lists.squeakfoundation.org squeak-dev-bounces@lists.squeakfoundation.org im Auftrag von Nicolas Cellier nicolas.cellier.aka.nice@gmail.com Gesendet: Freitag, 26. Februar 2016 19:31 An: The general-purpose Squeak developers list Betreff: Re: [squeak-dev] The Inbox: Collections-pre.679.mcz
But this already exist, at least for SequenceableCollection, try:
(1 to: 4) combinations: 2 atATimeDo: [:e | Transcript cr; show: e printString]
2016-02-26 16:05 GMT+01:00 <commits@source.squeak.orgmailto:commits@source.squeak.org>: A new version of Collections was added to project The Inbox: http://source.squeak.org/inbox/Collections-pre.679.mcz
==================== Summary ====================
Name: Collections-pre.679 Author: pre Time: 26 February 2016, 4:04:56.205127 pm UUID: 2ac5821c-d6f5-418c-ab07-ed3c2b9de62c Ancestors: Collections-eem.678
This is a new iteration method which allows the iteration over asymmetric pairs. I have found this useful in game collision detections or duplicate detections. Alternatively we might want to take a second collection as input and create asymmetric pairs from self and this second collection.
=============== Diff against Collections-eem.678 ===============
Item was added: + ----- Method: Collection>>asymmetricPairsDo: (in category 'accessing') ----- + asymmetricPairsDo: aBlock + + | iterationCollection currentElement | + iterationCollection := self copy. + + [currentElement := iterationCollection anyOne. + iterationCollection remove: currentElement. + iterationCollection isEmpty not] + whileTrue: [ iterationCollection + do: [:element | aBlock value: currentElement value: element]].!