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smalltalkpharosqueak

How to check if one of the superclasses contains a classVariable with a certain name?

I want to write a method that checks the list of all the superclasses ( allSuperclass method) and returns 'true' if one of them has a classVariable with a specific name. If none of them have it it'll return false. How do I do this?

Solution

  • classVarNames is a method that returns a collection of the class variable names.

    For example, if you'll add this method to Behavior class you should get a functionality you're asking for:

     superclassesHaveNoClassVar: name
    ^ self allSuperclasses noneSatisfy: [:class |
        class classVarNames includes: name]

    Nothing special. Just take allSuperclasses and check if none of them includes a desired variable name among it's classVarNames.