Polymorphic function example in JS

var PolyFunc = polymorph(
     function(a,b,c) {
         return "Three arguments version -- any types";
     },
     
     {i: Number, str: String},
     function(i,str) {
         return "Number and string passed";
     },

     {re: RegExp},
     function(re,a) {
         return "RegExp and something else passed";
     },
     
     {f: Function, b: Boolean},
     function(f,b) {
         return "Function and boolean passed";
     },
     
     {f: Function, i: Number},
     function(f,i) {
         return "Function and number passed";
     }
 );
  
  alert(PolyFunc(1,2,3)); // "Three arguments version -- any types"
  alert(PolyFunc(1,"qq")); // "Number and string passed"
  alert(PolyFunc(function() {}, true)); // "Function and boolean passed"
  alert(PolyFunc(function() {}, 1)); // "Function and number passed"
  alert(PolyFunc(/a/, 1)); // "RegExp and something else passed"
  alert(PolyFunc(/a/, "str")); // "RegExp and something else passed"