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I've heard that it's possible with extension methods, but I can't quite figure it out myself. I'd like to see a specific example if possible.
Thanks!
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The simplest way to implement a mixin in JavaScript is to make an object with useful methods, so that we can easily merge them into a prototype of any class.
A mixin is a class which adds functionality to other classes but which cannot itself be instantiated. Mixins are useful in object oriented languages which only support single inheritance as a sort of 'half way house' between single and multiple inheritance.
Mixins are hailed as interfaces with behavioral reuse, more flexible interfaces, and more powerful interfaces. You will notice all these have the term interface in them, referring to the Java and C# keyword. Mixins are not interfaces. They are multiple inheritance.
Mixins are sometimes described as being "included" rather than "inherited". In short, the key difference from an inheritance is that mix-ins does NOT need to have a "is-a" relationship like in inheritance. From the implementation point of view, you can think it as an interface with implementations.
It really depends on what you mean by "mixin" - everyone seems to have a slightly different idea. The kind of mixin I'd like to see (but which isn't available in C#) is making implementation-through-composition simple:
public class Mixin : ISomeInterface { private SomeImplementation impl implements ISomeInterface; public void OneMethod() { // Specialise just this method } } The compiler would implement ISomeInterface just by proxying every member to "impl" unless there was another implementation in the class directly.
None of this is possible at the moment though :)
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