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From: Dr J R Stockton on 18 May 2010 11:57
In comp.lang.javascript message <j9mdnbPrgdqQ4mzWnZ2dnUVZ8jKdnZ2d(a)gigane
ws.com>, Mon, 17 May 2010 19:38:21, Stefan Weiss <krewecherl(a)gmail.com>
posted:

>On 13/05/10 18:00, Dr J R Stockton wrote:
>> In comp.lang.javascript message <5dmdnU-R8ZcDbHTWnZ2dnUVZ8ludnZ2d(a)gigane
>> ws.com>, Wed, 12 May 2010 02:09:01, Stefan Weiss <krewecherl(a)gmail.com>
>> posted:
>>
>>>On 11/05/10 19:34, Dr J R Stockton wrote:
>>>> In comp.lang.javascript message <ab37b500-1b97-450c-9498-badd643ac361(a)j3
>>>> 5g2000yqm.googlegroups.com>, Sun, 9 May 2010 20:02:32, nick
>>>> <nick___(a)fastmail.fm> posted:
>>>>>What's the "best" way to determine if a variable is defined?
>>>>
>>>> I don't recall any problem in testing X for the value undefined by using
>>>>
>>>> var U
>>>> // ...
>>>> if (X==U) ...
>>>>
>>>> although one must remember not to define U.
>>>
>>>... and to use the strict comparison operator.
>>
>> Is that needed if X cannot be null ?
>
>No, but that wasn't mentioned anywhere by the OP.

Perhaps he did not think of it : the sort of people who actually use
'null' tend not to ask questions here.

I was wanting to verify my opinion, obtained from the definitive but
complex ECMA 262, that. since I only have actually used it to handle
argument lists with genuinely undefined arguments, I have nothing that
needs fixing.

--
(c) John Stockton, nr London UK. ?@merlyn.demon.co.uk DOS 3.3, 6.20; WinXP.
Web <URL:http://www.merlyn.demon.co.uk/> - FAQqish topics, acronyms & links.
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