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Message-ID: <2746027.qYQeW1xAia@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
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Date: Sat, 10 Nov 2012 10:21:45 +0100
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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.


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