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From: Jake Jarvis <pig_in_shoes@yahoo.com>
Newsgroups: comp.lang.javascript
Subject: Re: JavaScript: Trouble with switch Syntax
Date: Thu, 15 Dec 2011 01:06:10 +0100
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Message-ID: <9ksrviFfhrU1@mid.uni-berlin.de>
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On 15.12.2011 00:42, Jake Jarvis wrote:
> On 14.12.2011 23:58, Aaron Sawyer wrote:
>> "Gene Wirchenko"<genew@ocis.net> wrote in message
>> news:ug4ie75gitc6gc9rsse94i0slcpumt1pg0@4ax.com...
>>> Dear JavaScripters:
>>>
>>> I have hanged myself yet again with syntax.
>>>
>>> Did you know that -- in IE9, at least -- you can use
>>> otherwise
>>> instead of
>>> default:
>>> in a switch statement?
>>>
>>> Yes, you can. It does not throw an error, but it also does not
>>> do anything. Unless you count time wasted looking for a bug.
>>>
>>> I may as well ask if anyone else has committed such bogosities.
>>>
>> Not that particular one, but plenty of others.
>>
>> 'otherwise' (without the quotes) on a line by itself, presumably
>> following a
>> 'break;'will trigger Javascript/JScript/ECMAscript's default behaviors:

    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Sorry, concentrated on just a part of the quote.

Following a 'break' in a case's statement list, the 'otherwise' 
identifier will not be acted upon at all during evaluation.

>> (1) 'otherwise' is not a reserved word, therefore it is an identifier;
>> (2) the identifier 'otherwise' is not declared locally (in a 'var'
>> statement), therefore it must be a property attached to the global object
>> (and created there if not found);
>
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> That is not right in this case of "reading" (identifier 'otherwise'
> alone in expression or statement), if not found, an error must occur
> (see the abstract GetValue operation in the specifications).
>
>> (3) end of line has been encountered, therefore a semicolon must have
>> been
>> intended (!) and will be supplied by the language processor.
> <snip>
>
<snip>

-- 
Jake Jarvis