Cannot work with the nsIMutableArray in Javasript.

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Cannot work with the nsIMutableArray in Javasript.
\ stony_dreams (13 Jan 2008)
. \ Leonidas Jones (13 Jan 2008)

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Subject:	Cannot work with the nsIMutableArray in Javasript.
Group:	Mozilla-general
From:	stony_dreams
Date:	13 Jan 2008

Hello,

I was tryin to get nsIMutableArray to work from my extension but could not
do it. My code is as follows:

var testArray =
Components.classes["@mozilla.org/array;1"].createInstance(Components.interfaces. nsIMutableArray);
testArray.appendElement("abc", true);
alert(testArray.length);

Could anyone tell me what is the error, as I never get an alert.

Thanks...
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