Neither Smalltalk nor Self had interfaces, and never needed them. Let's be clear, interfaces give nothing to a dynamic language. If you bring them into a dynami

Neither Smalltalk nor Self had interfaces, and never needed them. Let's be clear, interfaces give nothing to a dynamic language. If you bring them into a dynamic language, you are essentially inventing code contracts - which can be useful, but they serve a fundamentally different purpose than a Java interface.