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| From | Thomas 'PointedEars' Lahn <PointedEars@web.de> |
| Newsgroups | comp.lang.javascript |
| Subject | Re: Date false |
| Date | Sat, 10 May 2014 10:36:22 +0200 |
| Organization | PointedEars Software (PES) |
| Lines | 31 |
| Message-ID | <9594146.3ms6Ipm6O6@PointedEars.de> (permalink) |
| References | <1JidnUNwV7viyvHOnZ2dnUVZ_t6dnZ2d@westnet.com.au> <falsy-date-20140509065812@ram.dialup.fu-berlin.de> <lkjdnp$rfg$1@speranza.aioe.org> <ToBoolean-20140509231033@ram.dialup.fu-berlin.de> |
| Reply-To | Thomas 'PointedEars' Lahn <cljs@PointedEars.de> |
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| Xref | csiph.com comp.lang.javascript:24069 |
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Stefan Ram wrote:
> Since the OP apparently had an object, I wondered whether an object
> can be made falsy somehow. The following did not work:
>
> if( { valueOf: function (){ return false; }})document.writeln( 'a' );
>
> . »Not work« means that it wrote »a«.
>
> In fact, »9.2 ToBoolean« says that any object always is converted
> to true,
No, it says that any *value of the Object type* is converted to “true”.
> so I really do not understand how in the OP's
>
> if( d )do_something();
>
> it is possible that »do_something();« is not executed, when d is
> either a string (that is not equal to »""«) or an object.
As the “typeof” operation (§11.4.3) resulted in "date" – neither "object"
nor "function" – we must assume that the value is of an additional type for
which the “ToBoolean” algorithm has been augmented in the used
implementation, according to §2 “Conformance”.
--
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.
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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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