Is it possible to implement dynamic getters/setters in JavaScript?

Question

I am aware of how to create getters and setters for properties whose names one already knows, by doing something like this:

// A trivial example:
function My         


        

Answer 1

The following could be an original approach to this problem:

var obj = {
  emptyValue: null,
  get: function(prop){
    if(typeof this[prop] == "undefined")
        return this.emptyValue;
    else
        return this[prop];
  },
  set: function(prop,value){
    this[prop] = value;
  }
}

In order to use it the properties should be passed as strings. So here is an example of how it works:

//To set a property
obj.set('myProperty','myValue');

//To get a property
var myVar = obj.get('myProperty');

Edit: An improved, more object-oriented approach based on what I proposed is the following:

function MyObject() {
    var emptyValue = null;
    var obj = {};
    this.get = function(prop){
        return (typeof obj[prop] == "undefined") ? emptyValue : obj[prop];
    };
    this.set = function(prop,value){
        obj[prop] = value;
    };
}

var newObj = new MyObject();
newObj.set('myProperty','MyValue');
alert(newObj.get('myProperty'));

You can see it working here.