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Re: eval - how to

Message-ID <2746027.qYQeW1xAia@PointedEars.de> (permalink)
From Thomas 'PointedEars' Lahn <PointedEars@web.de>
Organization PointedEars Software (PES)
Date 2012-11-10 10:21 +0100
Subject Re: eval - how to
Newsgroups comp.lang.javascript
References <k7iqg9$n49$1@speranza.aioe.org> <2261899.gBobAo4G4S@PointedEars.de> <k7jtpr$jqo$1@speranza.aioe.org>
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Cezary Tomczyk wrote:

> As for parsing JSON string and according to what wrote Asen. Quick
> review of David Mark code bring me [1]:
> 
> [...]
>   return function(s) { return (new Function('return (' + s + ')'))(); };
> [...]
> 
> On the other hand, looked into the code
> https://github.com/douglascrockford/JSON-js/blob/master/json2.js [2] and
> I see much, much more complicated regexps and rest of code to check JSON
> string before its evaluated.
> 
> Now I am more confused than before. Why code [1] is so simple and code
> [2] is so complicated?

One executes ECMAScript-conforming code.  The other evaluates *data* that 
needs to be parsed according to JSON, which is a *subset* of ES syntax, 
instead.

Until there were implementations of ES 5 there was no built-in JSON 
parser/serializer, and for some other programming languages there still is 
not.  So people (starting with Douglas Crockford, who devised JSON) wrote 
and are writing libraries to support it.


PointedEars
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eval - how to Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2012-11-09 12:47 +0100
  Re: eval - how to Asen Bozhilov <asen.bozhilov@gmail.com> - 2012-11-09 05:53 -0800
    Re: eval - how to Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2012-11-09 22:28 +0100
      Re: eval - how to Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-10 10:23 +0100
      Re: eval - how to Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-10 11:15 +0100
        Re: eval - how to Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2012-11-11 00:35 +0100
          Re: eval - how to Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-11 20:34 +0100
    Re: eval - how to Dr J R Stockton <reply1245@merlyn.demon.co.uk.invalid> - 2012-11-10 22:42 +0000
  Re: eval - how to Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-09 17:46 +0100
    Re: eval - how to Tim Streater <timstreater@greenbee.net> - 2012-11-09 17:00 +0000
      Re: eval - how to Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-09 18:19 +0100
    Re: eval - how to Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2012-11-09 22:49 +0100
      Re: eval - how to Asen Bozhilov <asen.bozhilov@gmail.com> - 2012-11-09 16:40 -0800
        Re: eval - how to Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-10 11:36 +0100
          Re: eval - how to Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2012-11-10 13:29 +0100
            Re: eval - how to Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-10 13:55 +0100
              Re: eval - how to Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2012-11-10 14:17 +0100
                Re: eval - how to Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-10 20:50 +0100
                Re: eval - how to Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2012-11-10 22:54 +0100
                Re: eval - how to Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-11 15:22 +0100
                Re: eval - how to Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2012-11-11 16:24 +0100
                Re: eval - how to Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-11 19:23 +0100
          Re: eval - how to Asen Bozhilov <asen.bozhilov@gmail.com> - 2012-11-11 10:40 -0800
            Re: eval - how to Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-11 20:41 +0100
              Re: eval - how to Asen Bozhilov <asen.bozhilov@gmail.com> - 2012-11-11 13:34 -0800
                Re: eval - how to Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-11 23:03 +0100
      Re: eval - how to Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-11-10 10:21 +0100
  Re: eval - how to SAM <stephanemoriaux.NoAdmin@wanadoo.fr.invalid> - 2012-11-10 04:16 +0100

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