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| From | Thomas 'PointedEars' Lahn <PointedEars@web.de> |
| Newsgroups | comp.lang.javascript |
| Subject | Re: Date false |
| Date | Fri, 09 May 2014 10:46:44 +0200 |
| Organization | PointedEars Software (PES) |
| Lines | 43 |
| Message-ID | <2257287.d1qsfXZ9WQ@PointedEars.de> (permalink) |
| References | <1JidnUNwV7viyvHOnZ2dnUVZ_t6dnZ2d@westnet.com.au> |
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Andrew Poulos wrote:
> I'm use JScript with ASP to read a db
>
> // if there's no error, d can either be a date or 0 (zero)
No.
> var d = e = rs("ExpiryDay").value;
>
> Then I use it in an if statement
>
> if (d) {
> // 'do something'
> }
>
> even when
> window.alert(d +" + "+ (typeof d));
> displays
> Thu May 14 00:00:00 UTC 1000 2015 + date
> 'do something' never happens.
>
> I'm confused. Can a date be false?
rs("ExpiryDay").value does not store a reference to a Date instance, but to
a host object. Otherwise the “typeof” operation would have resulted in
"object", not "date".
The return value of rs("ExpiryDay") probably also refers to a host object,
and using a host object or a host object’s property in a type-converting
test can be error-prone.
Using the (binary) “+” operator with at least one string value as operand
converts the other, non-string operand to the String type, and concatenates
the resulting values. "Thu May 14 00:00:00 UTC 1000 2015" indicates “not a
proper DateTime value in the database”. It makes sense that this is type-
converted to “false”.
--
PointedEars
FAQ: <http://PointedEars.de/faq> | SVN: <http://PointedEars.de/wsvn/>
Twitter: @PointedEars2 | ES Matrix: <http://PointedEars.de/es-matrix>
Please do not Cc: me. / Bitte keine Kopien per E-Mail.
Back to comp.lang.javascript | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Date false Andrew Poulos <ap_prog@hotmail.com> - 2014-05-09 14:18 +1000
Re: Date false Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-05-09 10:46 +0200
Re: Date false "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-05-09 10:58 +0200
Re: Date false Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-05-09 11:01 +0200
Re: Date false Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2014-05-09 17:27 -0300
Re: Date false Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2014-05-09 17:32 -0300
Re: Date false Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-05-10 10:36 +0200
Re: Date false Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2014-05-09 18:05 -0300
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