Re: Simple array reference question

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Message-ID	<3865616.zCVvmSepPV@PointedEars.de> (permalink)
From	Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To	Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
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Date	Wed, 12 Sep 2012 15:36:52 +0200
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Subject	Re: Simple array reference question
Newsgroups	comp.lang.javascript
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marat.rheingold@gmail.com wrote:

> Use named access like
> alert(window[param]);
> 
> Details: your arrays defined in scope of window. so you can access to them
> not only by variable name but as window property by their names

Wrong.  The correct answer is that variables are properties of the *Global* 
Object.  It can be referred to reliably by `this' in the global execution 
context:

  window.alert(this[param]);

Referring to variables as properties of the host object referred to by the 
host-defined `window' property of the Global Object is implementation-
dependent and unreliable, because that object may have properties with the 
same name (it certainly *has* host-defined properties) which can shadow 
user-defined variables.

It is of course a bad idea to rely on several global variables in the first 
place, and the substring() method is insufficient here.  A viable approach 
would include code like this:

  var params = (typeof Object.create == "function")
             ? Object.create(null)
             : {};

  params.all_ = (String(window.location.search).match(/^\??(.*)/)
                  || [, ])[1];

  … params.all_ …

PointedEars
-- 
When all you know is jQuery, every problem looks $(olvable).

Thread

Simple array reference question Tuxedo <tuxedo@mailinator.com> - 2012-09-12 12:09 +0200
  Re: Simple array reference question SAM <stephanemoriaux.NoAdmin@wanadoo.fr.invalid> - 2012-09-12 12:37 +0200
    Re: Simple array reference question Tuxedo <tuxedo@mailinator.com> - 2012-09-12 13:08 +0200
      Re: Simple array reference question Stefan Weiss <krewecherl@gmail.com> - 2012-09-12 16:03 +0200
        Re: Simple array reference question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-09-12 16:42 +0200
  Re: Simple array reference question marat.rheingold@gmail.com - 2012-09-12 05:34 -0700
    Re: Simple array reference question Tuxedo <tuxedo@mailinator.com> - 2012-09-12 15:10 +0200
    Re: Simple array reference question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-09-12 15:36 +0200
      Re: Simple array reference question Tuxedo <tuxedo@mailinator.com> - 2012-09-12 20:59 +0200

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