Joseph Spencer wrote:
Would it not be beneficial to bring Annex A into greater conformity with
the rest of the spec at this point?
Maybe, but there's non-zero risk and the work has non-trivial
opportunity cost. If you can come up with a minimal set of changes and
propose them here, I'll take a look and see if TC39 has the budget to
consider them.
/be
Such changes seem relatively safe (to a noobie that is ;), as any code
produced moving forward by devs would still parse just fine under older
implementations that allowed for the unwanted syntax. It seems that
doing so would also bring the ecosystem of implementations into greater
alignment moving forward.
-Joe
On Thu, 2012-09-06 at 16:41 -0700, Brendan Eich wrote:
Joseph Spencer wrote:
My apologies on that one. I meant to type the following:
PostfixExpression:
LeftHandSideExpression [no LineTerminator here] ++
LeftHandSideExpression [no LineTerminator here] --
PrefixExpression:
++ [no LineTerminator here] LeftHandSideExpression
-- [no LineTerminator here] LeftHandSideExpression
It appears to me that as currently written the following is considered
valid sytax:
++++someVar;
Yes, that is goofy. It dates back to ES1 -- if memory serves (and it may
not at this late date), my original Netscape 2 "Mocha" JS engine did not
parse this.
However, I think it may fall out of a desire by Microsoft back in the
ES1 days to support the goofy ability of "host objects" to return
References (ECMA-262 spec term).
I hadn't thought about es3 compatability though, so I could see the
reasoning in keeping it as is.
Yeah, engine implementors have no good incentive to tweak here, and some
legitimate fear of a breaking change that would only lose market share.
/be
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