Task

Demonstrate how to make the object respond (sensibly/usefully) to an invocation of a method on it that it does not support through its class definitions.

Note that this is not the same as just invoking a defined method whose name is given dynamically; the method named at the point of invocation must not be defined.

This task is intended only for object systems that use a dynamic dispatch mechanism without static checking.



Related task

   Send an unknown method call.


 
obj  = new Proxy({}, 
        { get : function(target, prop) 
            { 
                if(target[prop] === undefined) 
                    return function()  {
                        console.log('an otherwise undefined function!!');
                    };
                else 
                    return target[prop];
            }
        });
obj.f()        ///'an otherwise undefined function!!'
obj.l = function() {console.log(45);};
obj.l();       ///45
 