Re: Puzzling JS Error

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From	Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups	comp.lang.javascript
Subject	Re: Puzzling JS Error
Date	Sun, 12 Apr 2015 01:01:27 +0200
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Joao Rodrigues wrote:

> On 04/11/2015 06:42 PM, Thomas 'PointedEars' Lahn wrote:
>> Joao Rodrigues wrote:
>>> On 04/11/2015 11:15 AM, Thomas 'PointedEars' Lahn wrote:
>>>> or in my case I have written
>>>>
>>>>     if (typeof jsx.net == "undefined")
>>> […]
>>>
>>>> BTW, The “!==” instead of “!=” adds no efficiency here as both operands
>>>> are of the same type, String; however, it may quiet code linters such
>>>> as JSHint.
>>>
>>> JSLInt sees an error here: "Unexpected 'typeof'. Use '===' to compare
>>> directly with undefined."
>>
>> Read again.
> 
> ?

I was talking about the “!==” vs. “!=” with regard to tools like JS*H*int, 
which would recommend the former in order to avoid implicit type conversion 
if not configured otherwise.

You are talking about the wrong recommendation of 

  if (jsx.net === undefined)

of JS*L*int.  It is wrong because the “undefined” property of the global 
object has been writable before, but Douglas Crockford is either unaware of 
that or chooses to ignore it, like so many other issues.  Avoid JSLint.

-- 
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.

Thread

Puzzling JS Error "Mel Smith" <syntel@cox.net> - 2015-04-09 11:49 -0600
  Re: Puzzling JS Error "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2015-04-09 22:21 +0200
    Re: Puzzling JS Error "Mel Smith" <syntel@cox.net> - 2015-04-09 16:26 -0600
      Re: Puzzling JS Error "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2015-04-10 10:32 +0200
      Re: Puzzling JS Error Denis McMahon <denismfmcmahon@gmail.com> - 2015-04-10 14:51 +0000
        Re: Puzzling JS Error "Mel Smith" <syntel@cox.net> - 2015-04-10 09:48 -0600
          Re: Puzzling JS Error "Christoph M. Becker" <cmbecker69@arcor.de> - 2015-04-10 18:01 +0200
  Re: Puzzling JS Error Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-04-10 00:20 +0200
  Re: Puzzling JS Error JJ <jj4public@vfemail.net> - 2015-04-10 11:15 +0700
    Re: Puzzling JS Error Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-04-11 16:15 +0200
      Re: Puzzling JS Error Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2015-04-11 18:09 -0300
        Re: Puzzling JS Error Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-04-11 23:42 +0200
          Re: Puzzling JS Error Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2015-04-11 19:27 -0300
            Re: Puzzling JS Error Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-04-12 01:01 +0200
              Re: Puzzling JS Error Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-04-12 01:07 +0200
                Re: Puzzling JS Error Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2015-04-11 22:07 -0300

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