Good point, that's definitely a usable solution (also a better
representation of what I was attempting to describe).
I'd still be interested in a less-verbose/more-efficient approach using the
Symbol constructor, but it may not be a common enough scenario to justify
it when a workaround does exist.
On Fri, Jul 12, 2013 at 3:32 PM, Allen Wirfs-Brock <al...@wirfs-brock.com>wrote:
>
> On Jul 12, 2013, at 12:14 PM, Jeremy Martin wrote:
>
> In brief: allow Symbol's to be constructed with a single parameter, with
> the following behavior:
>
> > var obj = {};
> undefined
> > new Symbol({}) === new Symbol({})
> false
> > new Symbol(obj) === new Symbol(obj)
> true
>
>
> You can use a WeakMap to build your own object-selected Symbol factory:
>
> let known = new WeakMap;
>
> function ObjSymFactory(obj) {
> //handle obj === undefined however you want
> let sym = known.get(obj);
> If (!sym) {
> sym = new Symbol;
> known.set(obj,sym);
> }
> return sym;
> }
>
> Allen
>
>
>
--
Jeremy Martin
661.312.3853
http://devsmash.com
@jmar777
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