Javascript - function with optional parameters as object?

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I need a function that its parameter
is an object, and if I leave it empty it will load default
values.

something
like:

function loadMap(args) {
            //args is an object and its optional

 //this is what I want to do,
            test args and load defauts if necesary

 /*

            pseudocode:
 if args.latitude is not set then
 give it a default
            value

 if args.longitude is not set then
 give it a
            default value

 end pseudocode */



            alert("Latitude is "+args.latitude );
 alert("Longitude is "+args.longitude
            );
}

//outputs the default
            values
loadMap();

//outputs custom
            values
loadMap({latitude: "x.xxxx", longitude:
            "-x.xxxx"});


//and should work too and output one
            default and one custom value
loadMap({latitude:
            "x.xxxx"});

I found
this solution in this question ( href="https://stackoverflow.com/questions/148901/is-there-a-better-way-to-do-optional-function-parameters-in-javascript">Is
there a better way to do optional function parameters in Javascript?) but it
requires jQuery:
http://jsfiddle.net/xy84kwdv/

It's
ALMOST what I want but I don't want to depend on a jquery function.

Answer

Are you looking for something like:

function loadMap(args)
            { 
 args = args || {}; 
 args.latitude = args.latitude || "X.XXX";
            
 args.longitude = args.longitude || "Y.YYY"; 

            alert(args.latitude);
 alert(args.longitude);
};
            

loadMap({latitude:"custom_latitude"});