Le 21/01/2013 11:58, David Bruant a écrit :
Before the clear method, weakmaps had the following property: "you can
only modify a weakmap entry if you have the key". This property isn't
true anymore with .clear. This may be considered as abusive ambient
authority.
Let's see how this feature came to appear:
Jason Orendorff talked about Map.prototype.clear [1] (Oct 22nd). Seen as
a good idea. No discussion on whether it's a good idea for WeakMaps
specifically. Nicholas Zakas briefly mentions it in November [2]. No one
replied to it specifically. I haven't seen any discussion about it in
meeting notes [3]. A brief mention of Set/Map.prototype.clear [4] as a
review of the Oct 26th draft [5] (note, 4 days after Jason post, which
is a very short amount of time) but nothing about
WeakMap.prototype.clear. Implemented in Firefox soon after [6]...
I think WeakMap.prototype.clear slipped through the crack without being
specifically discussed. Based on what's publicly available, I don't see
anyone noticed and discussed the fact that WeakMap.prototype.clear
questions the property that was true before its adoption ("you can only
modify a weakmap entry if you have the key")
I think the property I mentioned is cricial to weakmap integrity and I
think WeakMap.prototype.clear should be considered for removal... or at
least proper discussion since none really happened from what I've found.
David
[1] https://mail.mozilla.org/pipermail/es-discuss/2012-October/025962.html
[2] https://mail.mozilla.org/pipermail/es-discuss/2012-November/026114.html
[3] https://github.com/rwldrn/tc39-notes
[4]
https://github.com/rwldrn/tc39-notes/blob/master/es6/2012-11/nov-27.md#review-of-new-draft-spec
[5] http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts
[6] https://bugzilla.mozilla.org/show_bug.cgi?id=814562
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