975412 - Length property of the (Weak){Map,Set} constructors should be 0

Status: RESOLVED FIXED

(Core :: JavaScript: Standard Library, defect)

Description

[Florian Scholz (Open Web Docs)]

If I see it correctly, there are some inconsistencies with the length property of Map, Set, WeakMap, WeakSet constructors:

The latest ECMAScript6 specification says they all should be 0:

> Besides the length property (whose value is 0)

Map http://people.mozilla.org/~jorendorff/es6-draft.html#sec-properties-of-the-map-constructor
Set http://people.mozilla.org/~jorendorff/es6-draft.html#sec-properties-of-the-set-constructor
WeakMap http://people.mozilla.org/~jorendorff/es6-draft.html#sec-properties-of-the-weakmap-constructor
WeakSet
http://people.mozilla.org/~jorendorff/es6-draft.html#sec-properties-of-the-weakset-constructor

It looks like it is only correct for WeakMap in Nightly:

Nightly 30.0a1 (2014-02-21) Ubuntu 13.10:
> Map.length
1
> Set.length
1
> WeakMap.length
0

Chromium Version 32.0.1700.107 Ubuntu 13.10:
> Map.length 
0
> Set.length
0
> WeakMap.length
0
> WeakSet.length
0

IE 11.0.9600.16428 Win7
> Map.length 
1
> Set.length 
1
> WeakMap.length
1

Comment 1

[Sankha Narayan Guria [:sankha]]

Attachment: patch v1

This should fix it.

Comment 2

[Jason Orendorff [:jorendorff]]

Comment on attachment 8379741 [details] [diff] [review]
patch v1

Review of attachment 8379741 [details] [diff] [review]:
-----------------------------------------------------------------

Nice.

Comment 3

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/integration/mozilla-inbound/rev/724240c06850

Comment 4

[Wes Kocher (:KWierso) (Not reading bugmail; email directly if needed)]

https://hg.mozilla.org/mozilla-central/rev/724240c06850