Add groupsOf:step: method to SequenceableCollection extension.

[tatut]

Add a partitionBy method and test.

Don't know if something similar or more idiomatic is available, but I didn't find it.

#(1 2 3 4 5 6) partitionBy: 2 >>> #(#(1 2) #(3 4) #(5 6))

[tatut]

Never mind, learned about groupsOf :D

[Ducasse]

Thanks for your will to improve Pharo. We are interested in other iterators :).
I learned that we have groupsOf: too!

[jecisc]

There are also #pairsDo: and #pairsCollect: that might interest you.

[tatut]

I would like to reintroduce this with a variant of the regular groupsOf:.

The groupsOf:step: will return successive groups and advance the start position by specified step after each.