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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: duplicator an array
Date: Thu, 14 Apr 2016 22:23:06 +0200
Organization: PointedEars Software (PES)
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Thomas 'Ingrid' Lahn wrote:

>   try
>   {
>     Object.defineProperty(Array.prototype, "duplicate", {
>       value: function () {
>         return this.concat(this.slice());
>       },
> 
>       /* optional; the default for each attribute is “false” */
>       configurable: true,
>       enumerable: false,
>       writable: true
>     });
>   }
>   catch
 .--------^
 :
(e)

>   {
>     console.warn("Array.prototype.duplicate cannot be (re)configured.");
>   }
> 
> […]
> Otherwise the only safe approach is to augment the instance instead of its
> prototype:
> 
> (function () {
>   var a = [1, 2, 3];
> 
>   a.duplicate = function () {
>     return this.concat(this.slice());
>   };

Or like above.

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