I was taking a look recently at the Proxy class created by Joey Lott of
Person13 for educational purposes, as I have just started learning OOP,
and a couple questions popped into my mind.
Here is the full class:
class ascb.util.Proxy {
public static function create(oTarget:Object,
fFunction:Function):Function {
var aParameters:Array = new Array();
for(var i:Number = 2; i < arguments.length; i++) {
aParameters[i - 2] = arguments[i];
}
var fProxy:Function = function():Void {
var aActualParameters:Array = arguments.concat(aParameters);
fFunction.apply(oTarget, aActualParameters);
};
return fProxy;
}
}
First of all, when populating aParameters, why couldn't you just do:
aParameters = arguments.slice(2);
That seems a lot more clean and improves readability a bit, no?
Second, why exactly do you need to concat the arguments of fProxy and
aParameters? I can see what it's doing; it's tacking on the additional
arguments supplied to Proxy.create onto the arguments of the fProxy
function (which is then returned) -- but I can't really envision a
situation where that would be needed? For instance:
class someClass {
private var _someMc:MovieClip;
function someClass(mc:MovieClip){
_someMc = mc;
_someMc.onRelease = Proxy.create(this,someMethod,1,2,3);
}
private function someMethod(a,b,c){
trace(a+" "+b+" "+c);
}
}
In what case would I be calling someMethod() via Proxy and supplying a
set of arguments that do not match the syntax of someMethod()? It seems
to me that you could just replace the following:
var aActualParameters:Array = arguments.concat(aParameters);
fFunction.apply(oTarget, aActualParameters);
with:
fFunction.apply(oTarget, aParameters);
Any clarification or insight is greatly appreciated.
Joseph Sorensen
aerosdesign.com/jsorensen
jsorensen[at]aerosdesign.com
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