[Pharo-users] Collection with memory?

Hi I need a collection that does the following: col := #('a12' 'b12' 'a13' 'a14' 'c23' 'a16') asMyNewCollection. col findFirst: [:each | each first = $a] > a12 col findFirst: [:each | each first = $a] > a13 Do you know a collection that would work? So I have the impression that such behavoir could be defined with a kind of methods wrapper. Stef