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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: Using getElementsByName on a DIV ?
Date: Tue, 26 Apr 2016 20:19:50 +0200
Organization: PointedEars Software (PES)
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Thomas 'PointedEars' Lahn wrote:

>   if (typeof Array.prototype.filter != "function")
>   {
>     Array.prototype.filter = function (filter, thisValue) {
>       if (arguments.length < 2) thisVal = this;
>       var a = [];
> 
>       for (var i in this)
>       {
>         var value = this[i];

          i = +i;

(conversion to Number) is mandatory if strict comparison is used below.  
Otherwise the following is never going to be executed as property names are 
of type String.

>         if (((i >>> 0) === i) && filter.call(thisValue, value, i, this))
>         {
>           a.push(value);
>         }
>       }

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