Bug 19523 – delete does not work in javascript

• Status: RESOLVED
• Resolution: INVALID
• Component: JavaScriptCore

[Eric Seidel (no email)]

delete does not work in javascript

<script>
var a = 1;
delete a;
alert(a);
</script>

This throws a reference error in FF, not in Safari.

[Oliver Hunt]

var declarations aren't deletable, per spec.  Firefox agrees with this.  I would close as invalid, but there is one case we do fuck up:

<script>
a = 1;
</script>
<script>
var a;
delete a;
alert(a);
</script>

the existing a should prevent the creation of a new static slot for a, so the delete should succeed in this case.

[Oliver Hunt]

Happily  we've already fixed this bug.  Closing as invalid because the original bug was not valid, and my updated bug was actaully already fixed.

[Cameron Zwarich (cpst)]

I added a test for the second scenario that Oliver mentioned in r34952, because we did not have any existing coverage of this case.