JavaScript Class Template

gistfile1.js

var myNamespace = myNamespace || {};

myNamespace.MyConstructor = function(opts) { this.options = opts; };

(function () {
    
    function myPrivateMethod(t) {
      console.log("myPrivateMethod" + t.options.a);
    }

    myNamespace.MyConstructor.prototype = {
      options: {},
      
        myPublicMethod: function () {
            myPrivateMethod(this);
        }
    };

})();


var o = new myNamespace.MyConstructor({a: 1});
o.myPublicMethod();

var o2 = new myNamespace.MyConstructor({a: "la quinta"});
o2.myPublicMethod();

Are the "options" and "privateField" class level variables here?
It looks like any change made by an instance to options or privateField would be reflected across all instances.

Yes, thanks for catching that.

The weakness of this approach is that the constructor cannot set private fields.