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Creates a new class.
Self() is shorthand for
Wraps a prototypal constructor as a Self class, returning the created class.
Property indicating the version of Self.
Calling returns an instance of the class, passing any arguments to the
Extends the class with a new class definition, returning the created class.
Sugar method for defining static properties on a class.
Copies another class's definitions into the current class.
The class that created this instance.
The parent class of this instance, same as
A prototype can be manually wrapped with
var EventEmitter = Self;
Or use the shorthand and pass your base prototype as the first parameter in your class definition.
var Foobar =;
initialize function is not the constructor. It's a
call super method, which gets called
by the real constructor. So as long as you keep the constructor semantics the
same, you'll be fine!
var MyModel =;
I recommend extending the Backbone library into your own namespace, so you don't have to call Self on the library everytime. It also provides a place for you to roll your own base class logic.
var mvc = _;mvcCollection = mvcCollection;
Since Self.js wraps every method with a function that unshifts the context onto
your method's arguments, there is overhead. You will have to weigh the
performance impact vs the convenience of an explicit
For me, an empty Self method is 2 orders of magnitude slower than an empty prototypal method. Keep in mind this overhead may be negligible compared to the time it takes to run the code in your method. Below are the actual timings of calling those methods on my machine.
To run these benchmarks yourself, clone this project and run:
npm install -d && node ./benchmarks.js
It should be possible to macro Self methods in-place (only in Node.js), thus removing the overhead of wrapping every method. If anyone is interested in this, please let me know and we can investigate it!