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Message-ID: <3865616.zCVvmSepPV@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization: PointedEars Software (PES)
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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Xref: csiph.com comp.lang.javascript:15872

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).