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Groups > comp.lang.javascript > #9246

Re: JavaScript: Trouble with switch Syntax

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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:
> (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>

-- 
Jake Jarvis

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JavaScript: Trouble with switch Syntax Gene Wirchenko <genew@ocis.net> - 2011-12-14 13:23 -0800
  Re: JavaScript: Trouble with switch Syntax Jake Jarvis <pig_in_shoes@yahoo.com> - 2011-12-14 23:32 +0100
    Re: JavaScript: Trouble with switch Syntax Tim Streater <timstreater@greenbee.net> - 2011-12-14 22:39 +0000
    Re: JavaScript: Trouble with switch Syntax Gene Wirchenko <genew@ocis.net> - 2011-12-14 18:11 -0800
      Re: JavaScript: Trouble with switch Syntax Dr J R Stockton <reply1150@merlyn.demon.co.uk> - 2011-12-16 21:28 +0000
  Re: JavaScript: Trouble with switch Syntax "Aaron Sawyer" <aaron.sawyer@deltaware.com> - 2011-12-14 18:58 -0400
    Re: JavaScript: Trouble with switch Syntax Jake Jarvis <pig_in_shoes@yahoo.com> - 2011-12-15 00:42 +0100
      Re: JavaScript: Trouble with switch Syntax Jake Jarvis <pig_in_shoes@yahoo.com> - 2011-12-15 01:06 +0100
    Re: JavaScript: Trouble with switch Syntax Gene Wirchenko <genew@ocis.net> - 2011-12-14 18:09 -0800
      Re: JavaScript: Trouble with switch Syntax Ross McKay <au.org.zeta.at.rosko@invalid.invalid> - 2011-12-15 18:33 +1100

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