619766 - [undefined].sort() does not return valid array object

Status: VERIFIED DUPLICATE of bug 614915

(Core :: JavaScript Engine, defect)

Description

[dave mankoff]

User-Agent:       Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b7) Gecko/20100101 Firefox/4.0b7
Build Identifier: Mozilla Firefox 4.0b7

Title really says it all: If you create an array containing a singled, undefined value, and call sort() on it, you don't get back an array. Instead, it seems to return a callable function of some sort

Expected:
[undefined].sort(); // == [undefined]

Actual:
[undefined].sort(); // == sort()
[undefined].sort()(); // == window



Reproducible: Always

Steps to Reproduce:
1. [undefined].sort().join('')
2. //raises exception
Actual Results:  
[undefined].sort(); // == sort()
[undefined].sort()(); // == window

Expected Results:  
[undefined]

This causes javascript errors in unexpected places that weren't crashing before. This is a fairly serious issue.

Comment 1

[Tom S. (please needinfo tschuster)]

This has been fixed in Bug 614915.

Comment 2

[Boris Zbarsky [:bzbarsky]]

Indeed.  Dave, thank you for the bug report.  Please verify that this is fixed once we ship beta 8?

Comment 3

[dave mankoff]

Yes, will do. Thanks!

Comment 4

[dave mankoff]

Just got the update. Looks happy. Thanks again.

Comment 5

[Boris Zbarsky [:bzbarsky]]

Great, thanks!