Comment #12 on issue 164 by erik.corry: Wrong order in Object properties
interation
http://code.google.com/p/v8/issues/detail?id=164
In fact Safari and FF do not agree. Consider:
<script>
var a = new Array();
a["x"] = 2;
a[3] = 2;
a[0] = 2;
var s = "";
for (x in a) { s += x; }
alert(s);
</script>
FF x30
Safari 03x
Chrome 03x
Opera x30
If you use Object() instead of Array() you get
FF x30
Safari x30
Chrome 03x
Opera x30
Or try the following:
<script>
var a = new Array();
a[6] = 2;
a[3] = 2;
a[80239402] = 2;
a[239402] = 2;
var s = "-";
for (x in a) { s += x + "-"; }
alert(s);
</script>
You will get:
FF -3-6-80239402-239402-
Safari -3-6-80239402-239402-
Chrome -3-6-239402-80239402-
Opera -6-3-80239402-239402-
Or the same with Object:
FF -6-3-80239402-239402-
Safari -6-3-80239402-239402-
Chrome -3-6-239402-80239402-
Opera -6-3-80239402-239402-
In the this case FF and Safari agree, but their order for arrays is not
predictable,
since it is neither sorted in numeric or in insertion order.
I haven't involved properties on the prototype here or deleted properties,
but there
are differences there too. It is best to write your JS programs so they do
not
depend on a certain iteration order.
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