Hello,
I've been thinking about our IEEE-inherited positive and negative zero and the
proposed ES6 Object.is and new collections semantics. I haven't followed any
discussions about this so I'm basing my understanding purely on the Harmony
wiki and toying around with the preliminary support in
2012/12/14 Allen Wirfs-Brock al...@wirfs-brock.com
BTW, I think there are probably other related issues that need to be
discussed/resolved at that level. For example, is SameValue really want we
want for Map/Set equivalence (the -0 different from +0 issue), did we agree
to parameterize the
2013/4/21 Allen Wirfs-Brock al...@wirfs-brock.com
Also note that JSON.parse('{__proto__: null}') does not create an object
whose [[Protoype]] is null because JSON.parse uses [[DefineOwnProperty]] to
create all its properties so this will just result in an own property whose
value is null.
2013/10/30 Vyacheslav Egorov m...@mrale.ph
5. A one shot property Math.H is created that returns ch' on the first
access and deletes itself.
Alternative step 5: Math.H is assigned ch'.
Rationale being faster polyfilled execution, in combination with a lack of
imagination from my side to come
2013/10/30 Vyacheslav Egorov m...@mrale.ph
Rationale being faster polyfilled execution
The main reason for H being one shot is to allow optimizing compiler
*elide* updating it in most cases to eliminate memory traffic.
Aaah. Thanks for pointing this out - I thought only of the polyfill
2013/11/29 Nick Krempel ndkrem...@google.com
Couldn't find anything on this in the archives, but is there a proposal
for:
if (let var = expr) {
// var in scope
}
...
(const should also be OK in place of let, at least for if and
switch.)
Thanks for taking this to the list. I was
2013/12/23 Brendan Eich bren...@mozilla.com
You are reasoning from general to particular, but without any reason to
focus on the particular of redefining a non-writable property from -0 to +0
or vice versa. There is no use-case there there! I bet Mark would find
that a subtle security
2013/12/23 Mark S. Miller erig...@google.com
No, Map and Set will equate -0 and +0.
\o/
Filed a bug on v8: https://code.google.com/p/v8/issues/detail?id=3069
___
es-discuss mailing list
es-discuss@mozilla.org
8 matches
Mail list logo
