That's communicated information, not a communications channel. The passed Symbol itself conveys that information, just as a passed string conveys other information. The Symbol itself or the string must have arrived over a communications channel, but that's another matter. If Alice conveys a string or Symbol from Carol to Bob, she enables Carol to convey to Bob whatever information Carol pre-packages into those bits. But this doesn't enable further communication between Bob and Carol.
And the conveyance itself is only a one-way communication even of these pre-packaged bits. Carol has no ability to tell that Bob received it, even if Bob wishes to tell her. On Thu, Sep 26, 2013 at 9:59 PM, Allen Wirfs-Brock <[email protected]>wrote: > > On Sep 26, 2013, at 8:44 PM, Mark S. Miller wrote: > > I think an adequate registry is exactly the two static methods Allen > proposed: > > Symbol.for(aString) ==> aSymbol > > Symbol.keyFor(aSymbol) ==> aString > > where for all strings S > > Symbol.keyFor(Symbol.for(S)) === S > > I think we've discussed this before -- it is effectively an interning > table for Symbols. The nice thing about it is that it is not a global > communications channel at all. There's no way to tell if a given string or > symbol has already been registered. The interning table can be weak or not > as the implementation prefers. > > > Well, Symbol.keyFor(aSymbol) tells you whether or no aSymbol has been > registered. Of course, you have to have either created the symbol or had > it passed to you in order to even make that test. But jn the later case, > would that make a 1-bit, one-time communications channel back to other > holders of the same symbol > > Allen > > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > > -- Text by me above is hereby placed in the public domain Cheers, --MarkM
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