How do I call a parent's class constructor with a var_args in Google Closure?

Question

I have this class

/**
 * @constructor
 * @param {...*} var_args
 */
var Map = function(var_args) {
    // insert all pairs of parameters as objects in the map
};

/**
 * @constructor
 * @extends {Map}
 * @param {...*} var_args
 */
var ExtendedMap = function(var_args) {
    goog.base(this, var_args); //<-- this obviously doesn't work!
};
goog.inherits(ExtendedMap, Map);

The problem araises given that ExtendedMap needs to extend a class (Map) which in it's constructor already has a var_args. How do I add my own constructor without messing up with the parent's constructor? I'm using the google-closure compiler.

Answer 1

You don't need to use goog.base, it is just a method to make things easier. In this case you would call the Map's constructor directly and using apply instead of call:

/**
 * @constructor
 * @extends {Map}
 * @param {...*} var_args
 */
var ExtendedMap = function(var_args) {
   Map.apply(this, arguments);
};
goog.inherits(ExtendedMap, Map);