Test for nested JavaScript object key

checkNested.js

 /**
  * Test for nested JavaScript object key
  *
  * @memberof Object.prototype
  * @param {...String} key string(s)
  * @return {Boolean} has nested key
  *
  * [http://stackoverflow.com/questions/2631001/javascript-test-for-existence-of-nested-object-key]
  */
Object.prototype.checkNested = function() {
  var self = this,
  	  args = Array.prototype.slice.call(arguments, 0);

  for (var i = 0; i < args.length; i++) {
    if (!self || !self.hasOwnProperty(args[i])) {
      return false;
    }
    self = self[args[i]];
  }
  return true;
}