On Sun, Jul 27, 2014 at 2:10 PM, Anne van Kesteren <annevk@annevk.nl> wrote: > On Sun, Jul 27, 2014 at 7:52 PM, Glenn Adams <glenn@skynav.com> wrote: > > On Sun, Jul 27, 2014 at 1:42 PM, Anne van Kesteren <annevk@annevk.nl> > wrote: > >> I did not talk about triggering the observers. How does adding a > >> listener clearly have side effects? > > > > (1) it mutates the list of listeners on some node > > Perhaps I should have said observable side effect from the perspective > of those adding the listener. > As has been pointed out, it is apparently observable now, i.e., by replacing the node with a partial clone (that doesn't clone its listener list) and then dispatching an event to the node that would have but now does not invoke a previously registered (but now missing) listener. > > > > (2) it creates a future promise to invoke those listeners, which > invocation > > may (and usually does) produce side effects > > That's immaterial. > > > -- > http://annevankesteren.nl/ >
Received on Sunday, 27 July 2014 18:36:03 UTC