Use cases for WeakMap
Mark S. Miller
erights at google.com
Sat May 14 23:59:07 PDT 2011
On Sat, May 14, 2011 at 11:57 PM, Erik Corry <erik.corry at gmail.com> wrote:
> On May 15, 2011 2:55 AM, "Boris Zbarsky" <bzbarsky at mit.edu> wrote:
> > On 5/14/11 6:37 PM, Oliver Hunt wrote:
> >> Can you provide a use case where you have an object key as the usual
> programming idiom?
> > Attaching metadata to object without polluting the objects themselves.
> That sounds more like private names
Private name and soft field lookup inherits. WeakMap lookup doesn't.
> > For example, Firefox extensions want to do this all the time for various
> DOM objects (and especially Window).
> > -Boris
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