Created
January 21, 2011 21:25
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// Util | |
function placeholder(){} | |
function derive(Child, Parent){ | |
placeholder.prototype = Parent.prototype | |
var proto = new placeholder() | |
for (var i = 2, l = arguments.length; i < l; i++){ | |
var mixin = arguments[i] | |
for (var key in mixin) proto[key] = mixin[key] | |
} | |
return Child.prototype = proto | |
} | |
// Element | |
function Element(){ | |
} | |
Element.prototype = { | |
render: function(){ | |
} | |
} | |
// Transform | |
function Transform(){ | |
} | |
Transform.prototype = { | |
rotate: function(){ | |
} | |
} | |
// Shape | |
function Shape(){ | |
this._() | |
} | |
Shape.prototype = derive(Element, Transform, { | |
_: Element, | |
_render: Element.prototype.render, | |
render: function(){ | |
this._render() | |
}, | |
draw: function(){ | |
} | |
}) | |
// Triangle | |
function Triangle(){ | |
this.__() | |
} | |
Triangle.prototype = derive(Shape, { | |
__: Shape, | |
__draw: Shape.prototype.draw, | |
__render: Shape.prototype.render, | |
draw: function(){ | |
this.__draw() | |
}, | |
render: function(){ | |
this.__render() | |
} | |
}) |
This snippet should be illuminated with this link http://blog.calyptus.eu/seb/2011/01/javascript-call-performance-just-inline-it/
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In the other words, you eunuchized live prototype inheritance for sake of composed objects. If someone override base method later, children __________ references will never be updated.