overloading

overloading.js

function one_arity(first_arg) {
  console.log("one_arity: " + first_arg);
}

function two_arity(first_arg, second_arg) {
  console.log("two_arity: " + first_arg, second_arg);
}


function caller() {
  var method_to_call = null,
      mappings = {};

  mappings[[typeof(1)]] = one_arity;
  mappings[[typeof(1), typeof("a")]] = two_arity;


  // get the types
  var types = [],
      args = Array.prototype.slice.call(arguments, 0);

  args.forEach(function(value, idx) { types[idx] = typeof(value); });


  // get the method and invoke it
  var method = mappings[types];
  method.apply(method, arguments);
}


caller(1);
caller(1,"2");