I'm sorting array:

myArray.sort(comparators.some_comparator);

and I have several comparator to choose from:

comparators = {

   asc_firstname_comparator : function(o1, o2){
    ...
   }

   desc_firstname_comparator : function(o1, o2){
    ...
   }

   etc...
}

I want to write function which returns certain comparator depending on input data. It should figure out comparator from string inputs, something like this:

function chooseComparator(field, order){

  return "comparators."+order+"_"+field+"_comparator";

}

So is it possible to pass only function name string to sort() method or I'll need to pass reference to correct comparator somehow?