Returning an array from a JavaScript XPCOM
IDL
The second last word is the type of the objects in the array.
void getArray(out unsigned long count, [array, size_is(count), retval] out string retv); XPCOM
getArray: function(count) {
var returnValue = ["foo", "bar", "baz"];
count.value = returnValue.size;
return returnValue;
}Calling code
var xpcom = Components.classes["@example.com;1"].getService(Components.interfaces.nsIExample);
var array = xpcom.getArray({});