Javascript redefine and override existing function body

Question

I am wondering can we still change the function body once it is constructed ?

     var O = function(someValue){
           this.hello = function(){
                 


        

Answer 1

If I recall correctly, functions that are direct members of objects take precedence over like-named members of that object's prototype. Therefore, O.prototype.hello is usurped by O.hello, even though the former is defined later in the code.

The reason someValue isn't available to your O.prototype.hello is because the scope of someValue is constrained to the constructor function and any functions defined or executed within it. Since O.prototype.hello is defined outside the scope of the O constructor, it doesn't know about someValue