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Message-ID: <60636642.clnVRmuXiz@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Tue, 11 Mar 2014 18:01:29 +0100
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Subject: Re: arr.push(obj);
Newsgroups: comp.lang.javascript
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Xref: csiph.com comp.lang.javascript:23529

Christoph Michael Becker wrote:

> jonas.thornvall@gmail.com wrote:
>> Well i sure did, this for loop code will store values of index i at
>> their respective  negative indexes. Just run it. There is no problem
>> to store and reach values at negative indexes but i want to store
>> objects not values.
>> 
>> <script type="text/javascript">
>> var arr=[];
>> for (i=10;i>=-20;i--) {arr[i]=i;}
>> arr[-22]=-22;
>> for (i=10;i>=-22;i--) {document.write(arr[i],",");}
>> </script>
> 
> As Evertjan has already pointed out,

… being wrong on several accounts …

> there are no negative array indexes, but the "index" is rather the name of
> a property of the array object in this case.

In *all* cases.  It is only that with Array instances some property names, 
the array indexes, are special.

> I suggest to use ECMAScript Arrays the way they're meant to be used, and
> use indexes from 0 to n, and scale them as appropriate.

As long as the “length” property is not used directly, it can be useful to 
have an *Array* instance with user-defined properties whose names are string 
representations of negative numbers, positive numbers greater than 2³² − 1,  
and non-integers.
 
> BTW: please try to avoid Google Groups for posting if possible; at least
> avoid overlong lines when posting via GG.

ACK.

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