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Groups > comp.lang.javascript > #24063

Re: Date false

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Em 09/05/2014 02:02, Stefan Ram escreveu:
> Andrew Poulos <ap_prog@hotmail.com> writes:
>> Can a date be false?
>
>    The six falsy values are:
>
>        undefined
>        null
>        NaN
>        0
>        ""
>        false
>

There are seven "falsy" values indeed: false, +0, -0, "", NaN, null, and 
undefined, according to ES 5.1, § 9.2 (ToBoolean):
<http://ecma-international.org/ecma-262/5.1/#sec-9.2>

>> 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.
>
>    If you write it behind »//«, then 'do something' is part
>    of a comment, and comments never happen.

"\\" was a comment by the OP.


-- 
Joao Rodrigues (J.R.)

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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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