Generating generic getters and setter on javascript object

To all time travelers like me:

It was not possible at the time the question was asked, but it is already possible in present versions of EcmaScript via so-called proxy objects. See more here:

• Is it possible to implement dynamic getters/setters in JavaScript?
• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy

Not possible in standard javascript at this point.

I suppose you are expected to handle this yourself:

if (!object.hasOwnProperty('foo')) {
  // object has a foo property, its value might be undefined

} else if (typeof object.foo != 'undefined') {
  // there is a foo property elsewhere on object's prototye chain with 
  // a value other than undefined

} else {
  // the foo property might exist on the prototype chain with
  // a value of undefined, or might not exist on the chain at all
}

I feel like you guys were looking for something like this

function getterSetter()
{
var valA;
this.set=function (propName,val)
{
if(typeof this[propName] =='function' )
{
return false;
}
this[propName]=val;
}
this.get=function (propName,val)
{
if(typeof this[propName] =='function' )
{
return false;
}
return this[propName];
}
}

Here the set and get methods are setter and getter. You can verify this with following code.

var testObj=new getterSetter();
testObj.set('valA',10);
alert(testObj.get('valA'));

Also, checking for the propName to set/get is not a function.