As far as I’m aware, Javascript (at least as it exists now) doesn’t support operator overloading.
The best I can suggest is a class method for making new quota objects from several others. Here’s a quick example of what I mean:
// define an example "class"
var NumClass = function(value){
this.value = value;
}
NumClass.prototype.toInteger = function(){
return this.value;
}
// Add a static method that creates a new object from several others
NumClass.createFromObjects = function(){
var newValue = 0;
for (var i=0; i<arguments.length; i++){
newValue += arguments[i].toInteger();
}
return new this(newValue)
}
and use it like:
var n1 = new NumClass(1);
var n2 = new NumClass(2);
var n3 = new NumClass(3);
var combined = NumClass.createFromObjects(n1, n2, n3);