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From: "Christoph M. Becker" <cmbecker69@arcor.de>
Newsgroups: comp.lang.javascript
Subject: Re: duplicator an array
Date: Thu, 14 Apr 2016 19:41:55 +0200
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On 14.04.2016 at 06:00, Aleksandro wrote:

> On 13/04/16 22:27, JRough wrote:
>
>> Okay, supposing the above works then I thought I would make an anonymous function in the duplicator method.  This would make it work the way the problem was first outlined above.  The only problem is how do I capture the value of the two arrays?
>>
>>
>> I guess you would do something like Array.prototype.duplicator = (function (){
>>     return  this.concat(arr.slice(0));
>> })()
> 
> Try:
> 
> Array.prototype.duplicate = function ()
> {
> 	this.push.apply(this, this.slice(0))
> }


The usual caveats wrt. augmenting built-in objects apply, though, see
e.g.
<http://peter.michaux.ca/articles/javascript-the-good-parts-built-in-object-augmentation-and-namespacing>.

-- 
Christoph M. Becker