What is the web3 filter.watch() scope?

Question

If I create a nested filter.watch

filter_a.watch(
    filter_b.watch();
);

If I call

filter_a.stopWatching();

does filter_b.watch() go out of scope for web3.js? Does geth keeps sending filter_b.watch() results?

Answer 1

filter b will still be polled and receive logs. And as you should provide a callback for filter b, this callback will still be called.

There is no "scope" here, as in JavaScript scopes for filters.

filter_b.watch() will simply take the callback given and call it as often as there are logs matching the callback come.