Hi John!
I think the js run-time already has that information at hand, so as
long as we don't implement this as pure syntactical sugar, there would
not be a need to keep an extra reference to anything, because it would
be already there. The run-time will know which instance the invoked
method belongs to.
Well no, you're wrong here: the runtime does not have this information
at hand. In your example (simplified)
```
var reqManager = new RequestManager();
function addEventListener(f) {
console.log(f);
f(event);
}
addEventListener(reqManager.responseHandler);
```
the `addEventListener` function will not know that the function `f` you
passed was a method of the `reqManager` instance. It cannot distinguish
that call from
```
addEventListener(RequestManager.prototype.responseHandler);
```
or
```
var g = otherReqManager.responseHandler;
addEventListener(g);
```
It is exactly the same function that is passed in all three cases. There
is no instance bound to `f`, and `f(event)` will not invoke it as a
method (with a receiver/`this` value).
Best regards,
Bergi
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