Collective Behavior
نویسنده
چکیده
When modelling a system, often there are properties and operations related to a group of objects rather than to a single object only. For example, given a person object with an income property, the average income applies to a group of persons as a whole rather than to a single person. In this paper we propose to extend programming languages with the notion of collective behavior. Collective behavior associates custom behavior with collection instances, based on the type of its elements. However, collective behavior is modeled as part of the element’s rather than the collection’s class. We present a proof-of-concept implementation of collective behavior using Smalltalk, and validate the usefulness of collective behavior considering a real-life case study: 20% of the case-study’s domain logic is subject to collective behavior.
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