Elegant way of checking parameter types in Javascript

gistfile1.js

function something(param1, param2, param3, param4){
  // args contains all the parameters as array
  // i.e args[0] == param1, args[1] == param2 and so on
  var args = Array.prototype.slice.call(arguments);
}

//To check if a variable is of type Sting
var str = "Samar",
    bool = false;

  bool = /string/.test(typeof str); //Returns true as str is a type of String.
  bool = /string|number|object|function|boolean/.test(typeof str1); //Returns true if str1 is string|number|Object|funciton|boolean