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Retrieve an element of an orderedcollection in pharo

I have a difficult problem. I have a method that return an OrderedCollection(an orderedCollection(String),an orderedCollection(String), an orderedCollection(Date)).

I want to have this result an orderedCollection(String, String, Date). How Can i do ?

Solution

  • If your composite collection only includes subcollections with one element, you can use

    result := theCollection collect: [:sc| sc first]

    where theCollection stands for your OrderedCollection of OrderedCollections.

    Otherwise, if the subcollections do not meet this condition and you want to put all elements into a single collection use

    result := theCollection gather: [:sc | sc]

    For example:

    #(#(1) #(2) #(3)) collect: [:sc | sc first]

    will give as result the Array #(1 2 3) (similarly for OrderedCollections).

    On the other hand

    #(#(1 2) #(3) #(4 5 6)) gather: [:sc | sc]

    will produce #(1 2 3 4 5 6).