This did not get to the list, reposting... -------- Original Message -------- From: Herby Vojčík <[email protected]> Subject: Fail-fast on non-existing [[Get]] Date: Fri, 12 Oct 2012 22:42:05 +0200 To: ECMAScript discussion <[email protected]>
Hello! I have just looked the video on channel9 between Lars Bak and Anders Hejlsberg, and it gave me one idea. It seems people sometimes worry about (basically because of a typo) that they [[Get]] a non-existing property but as it stands, it just returns undefined and goes happily on. I see two solutions: - add something to the freeze, seal, preventExtensions family which would set an object to the fail-fast [[Get]] state. - use a Proxy in the proto chain to trap the unknown [[Get]] and throw early Do you think this needs a solution at all? If yes, which option would you favour? Herby P.S.: In the latter case, I see the possibility of putting ClosedFormObject (or whatever name) constructor function which would have a proxy for a .prototype just one step below Object, and let classes that would want to throw on default-undefined-[[Get]] just derive from that or its ancestors. Do you think this is minimal enough so it can be put directly into language (if the solution does not have some flaws which are not apparent to me)? _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
