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Data Dumper
[Javascript Toolbox]  [Example]  [Source]
Description:
Perl has a great module called Data::Dumper that will show you an object's structure easily and quickly. I often found myself wanting to see similar output in Javascript, so I built a DataDumper library which gives similar type of output.
If you're building complex data structures or objects, this lirary can help you debug your code and see exactly what data is where!

Example:
Given this javascript code:
var x = new Object();
x["stringValue"] = "mystring";
x["numberValue"] = 123;
x["booleanValue"] = false;
x["nullValue"] = null;
x["functionValue"] = function dummy() { };
x["nestedStructures"] = new Object;
x["nestedStructures"]["subObject"] = new Object();
x["nestedStructures"]["subObject"]["subArray"] = new Array("one",2,false,new Object(),new Array());
x["nestedStructures"]["subObject2"] = new Object();
x["nestedStructures"]["subObject2"]["subArray"] = new Array();
x["nestedStructures"]["myoption"] = new Option('t','v');
Running this: 
DumperTagProperties["OPTION"] = ['text','value','defaultSelected'];
DumperWrite(x);
results in this:
There are also functions included to easy Alert the structure and Popup a window with the output!