There are already #pairsDo: and #pairsCollect: that could be used:

#(a b c d e f g h) pairsCollect: [ :x :y | y ]

=> #(#b #d #f #h)

> On 19 Apr 2017, at 22:12, Tudor Girba <tudor@tudorgirba.com> wrote:
>
> I like this one.
>
> Doru
>
>
>> On Apr 19, 2017, at 8:43 PM, Stephane Ducasse <stepharo.self@gmail.com> wrote:
>>
>> Hi
>>
>> I have
>>
>> #(#Object #subclass: #Point #instanceVariableNames: 'x y' #classVariableNames: '' #package: 'Kernel-BasicObjects') and I would like to select on the second elements.
>>
>> I was thinking that
>>
>> #(#Object #subclass: #Point #instanceVariableNames: 'x y' #classVariableNames: '' #package: 'Kernel-BasicObjects') selectEvery: [ :i | i \\ 2 = 0 ]
>> could be a nice iterator.
>>
>> What do you think?
>>
>>
>> Stef
>>
>
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> That is, if it is expected, it already happened."
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>