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Traits.js (Apache License 2.0) is a library for creating modular components using traits. Traits can be used to recombine reusable code in a similar way to mixins without introducing traditional classes. Within the library, traits are like JavaScript functions, in that they’re first-class and anonymous.
Trait.compose can be used to combine a set of traits, which can then be instantiated with Trait.create. From the documentation:
Create is similar to the Ecmascript 5 built-in Object.create except that it generates high-integrity, “final” objects.
It also ensures the resulting object is frozen, and this is bound to the instantiated object in all accessors and methods.
As you can see by what create does, this process generates objects that are more strictly controlled than mixin or multiple inheritance-based code.
The tutorial has a good example called An Enumerable Trait which helped me get the hang of the basic usage of the library.
