I think what I need is a map with primitive keys and non-null object values, entries of which can be removed & GC-ied if values are no longer referenced. If I understand Map / Set / WeakMap proposals non of them can be used to solve this issue or do I miss something ?
Regards -- Irakli Gozalishvili Web: http://www.jeditoolkit.com/ Address: 29 Rue Saint-Georges, 75009 Paris, France (http://goo.gl/maps/3CHu) On Friday, 2011-11-11 at 15:39 , Oliver Hunt wrote: > A weak map can only remove an entry if both the key and value have died, in > many ES implementations a number of the primitives are not gc allocated and > so can never die, or are cached globally so have lifetime unrelated to any > given program. > > The net effect of allowing such primitive values to be used as keys would be > to make the map "strong" and the associated values would not be able to be > collected. > > --Oliver > > On Nov 11, 2011, at 3:28 PM, Irakli Gozalishvili wrote: > > I really need to know why WeakMaps don't accept primitives as keys, can > > anyone please reply ? > > > > Thanks! > > -- > > Irakli Gozalishvili > > Web: http://www.jeditoolkit.com/ > > Address: 29 Rue Saint-Georges, 75009 Paris, France (http://goo.gl/maps/3CHu) > > > > > > On Thursday, 2011-11-10 at 10:31 , Irakli Gozalishvili wrote: > > > > > Hi, > > > > > > I was wondering what is a reason for disallowing non-object values as > > > keys in WeakMaps ? > > > > > > Also, I think I have a pretty good use case for primitive keys: > > > > > > Worker process sends messages to the (main) UI process, to initiate UI > > > notification. If user clicks that notification main process will worker > > > know that given notification was clicked: > > > > > > (function(exports) { > > > > > > let id = 0 > > > let listeners = WeakMap() > > > > > > exports.notify = function notify({ onClick, message }) { > > > if (onClick) listeners.set(++id, onClick) > > > self.postMessage({ id: id, message: message }) > > > } > > > > > > self.onmessage = function({ id }) { > > > let listener = listeners.get(id) > > > if (listener) listener() > > > } > > > > > > })(this) > > > > > > Is my use case invalid ? At the moment I use custom map implementation > > > with a limited size, once map hits the limit oldest entries will be > > > removed. > > > > > > Regards > > > -- > > > Irakli Gozalishvili > > > Web: http://www.jeditoolkit.com/ > > > Address: 29 Rue Saint-Georges, 75009 Paris, France > > > (http://goo.gl/maps/3CHu) > > > > > > > _______________________________________________ > > es-discuss mailing list > > es-discuss@mozilla.org (mailto:es-discuss@mozilla.org) > > https://mail.mozilla.org/listinfo/es-discuss >
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