About a mont ago at one of my contract jobs we had a discussion about the Prototype design pattern and mixins. The discussion took place around javascript, which is by language construct a prototyped language. For those who don't know about the Prototype design pattern let me quote from the Gang-of-Four, "Specify the kinds of objects to create using a prototypical instance, and create new objects by coping this prototype." Or, Wikipedia, "Prototype-based programming is a style of object-oriented programming in which classes are not present, and behavior reuse (known as inheritance in class-based languages) is performed via a process of cloning existing objects that serve as prototypes. This model can also be known as class-less, prototype-oriented or instance-based programming."

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