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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: function to get frequencies of a char array
Date: Tue, 27 Jan 2015 22:15:55 +0100
Organization: PointedEars Software (PES)
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Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
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Christoph M. Becker wrote:

> Thomas 'PointedEars' Lahn wrote:
>> Christoph M. Becker wrote:
>>> As we were talking about array *indexes*[1], values equal to or beyond
>>> 2³² are irrelevant, anyway.
>>>
>> […]
>   for (var i = 0, len = a.length; i < len; ++i)
>   {
>     /* NOTE: hasOwnProperty() may be required */
>     var e = a[i];
>     if (e) { counts[e] ? ++counts[e] : (counts[e] = 1); }
>   }
> 
> Indeed, `e` is no array index, but `i` is.  Therefore the value of the
> properties of `count` is always less than 2³² (even though it could be
> greater than or equal to 2³¹).

But you can have arrays and array-like objects with up to 2⁵³ elements and 
iterate over them this way:

<http://PointedEars.de/wsvn/JSX/trunk/array.js>

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