Object Composition
“Object Composition Assembling or composing objects to get more complex behavior.” ~ Gang of Four, “Design Patterns: Elements of Reusable Object-Oriented Software”
“Favor object composition over class inheritance.” ~ Gang of Four, “Design Patterns”.
One of the most common mistakes in software development is the tendency to overuse class inheritance. Class inheritance is a code reuse mechanism where instances form is-a relations with base classes. If you’re tempted to model your domain using is-a relations (e.g., a duck is-a bird) you’re bound for trouble, because class inheritance is the tightest form of coupling available in object-oriented design, which leads to many common problems, including (among others):
- The fragile ...
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