Using Properties instead of Params

Yes.  Basically, whatever function you'd determine to be your constructor would assign all your properties.  It would look like:

function constructorA() {
    var localObject = {prop1: '', prop2: 0} //Sets up the object with properties and default values

    localObject.Method1 = function () {
        Log.Message('Valjean 1: ' + localObject.prop1);
    }
    localObject.Method2 = function () {
        Log.Message('Marius: ' + localObject.prop2);
    }
    return localObject;
}

function Main() {
    var myObject = new constructorA();
    myObject.prop1 = 'Who am I?"
    myObject.prop2 = 24601;
    myObject.Method1();
    myObject.Method2();
    
}