On Mon, Dec 27, 2010 at 9:54 AM, Wes Garland <w...@page.ca> wrote: > I think Mark's suggestion here is very sensible. My gut tells me that it > has a low probability of breaking the web, yet it offers room for > implementers to provide a fast path for numeric object indices while > offering an opportunity to codify standard practice. >
I like Dave Herman's strawman at < http://wiki.ecmascript.org/doku.php?id=strawman:enumeration>. It is a nice simple deterministic spec that has the pleasant index-first property mentioned above. It also plugs the other annoying source of non-determinism -- what happens when insertions and/or deletions happen during enumeration -- by mandating a snapshotting semantics. Together, I think this is a good blend of efficiency, implementability, and programmer understandability. Dave, under the spec for "Operation OwnProperties(obj)" step 1, you don't explicitly state that these index properties are to be enumerated in numeric order. An oversight? Also, you misstate that indexes are "properties with values that can be converted to numbers via ToUInt32". I think you meant something more like the text from 15.4: A property name P (in the form of a String value) is an array index if and > only if ToString(ToUint32(P)) is equal to P and ToUint32(P) is not equal > to 2**32-1. -- Cheers, --MarkM
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