github at esdiscuss.org (2013-07-12T02:25:50.900Z)
> var let = function() {};
> let();
If let is a contextual keyword (in non-strict mode of course), then we can
look ahead to the token after `let` to validate it. An open paren cannot
follow a let *keyword*, so therefore it must be an identifier.
> var let = { it: "be" };
> let.it // be
Same logic applies. A dot cannot follow a let keyword so we parse it as an
identifier.
On the other hand, an open square bracket *can* follow a let keyword (by
array destructuring), so we have a potential ambiguity there.
- Kevin
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> var let = function() {}; > let(); > If let is a contextual keyword (in non-strict mode of course), then we can look ahead to the token after `let` to validate it. An open paren cannot follow a let *keyword*, so therefore it must be an identifier. var let = { it: "be" }; > let.it // be > Same logic applies. A dot cannot follow a let keyword so we parse it as an identifier. On the other hand, an open square bracket *can* follow a let keyword (by array destructuring), so we have a potential ambiguity there. - Kevin -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.mozilla.org/pipermail/es-discuss/attachments/20121116/c945ad35/attachment.html>