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Message-ID: <1983193.7UhRnYkZ6n@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Sun, 28 Oct 2012 18:07:06 +0100
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Subject: Re: Built-in native method
Newsgroups: comp.lang.javascript
References: <k5sbuj$bt8$1@speranza.aioe.org> <67583587.7BbXikoxoM@PointedEars.de> <k69jek$r9i$1@speranza.aioe.org> <3102322.j8kCu7WbkW@PointedEars.de> <k6jgm5$snj$1@speranza.aioe.org> <8635315.16DEVHx3j1@PointedEars.de> <k6jnnq$fro$1@speranza.aioe.org>
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Cezary Tomczyk wrote:

> W dniu 2012-10-28 17:12, Thomas 'PointedEars' Lahn pisze:
>> Cezary Tomczyk wrote:
>>> W dniu 2012-10-25 00:03, Thomas 'PointedEars' Lahn pisze:
>>> [...]
>>>>     if (String.prototype.propertyIsEnumerable("trim"))
>>> Quick results from Google Chrome 22.0.1229.94 console.
>> Unreadable.  What is your input, what V8's output?  Which OS and
>> platform?
> 
> OS: Windows 7
> Platform: Win32

I would consider "Windows 7 32-bit" the OS then and "Intel x86 or 
compatibles" the (hardware) platform, but I know what you mean.
 
> Let me do in that way:
> 
> ID - Input data in Google Chrome console
> R - result in console
> 
> ID:   String.prototype.propertyIsEnumerable("trim")
> R:    false
> 
> ID:   String(String.prototype.trim);
> R:    "function trim() { [native code] }"
> 
> ID:   String.prototype.trim = function(){ alert('test'); return false; };
> R:    function (){ alert('test'); return false; }
> 
> ID:   String.prototype.trim
> R:    function (){ alert('test'); return false; }
> 
> ID:   String(String.prototype.trim);
> R:    "function (){ alert('test'); return false; }"

JFYI: In the Chromium/Chrome console a type conversion to String so far is 
implicit for Function instances.
 
> ID:   String.prototype.propertyIsEnumerable("trim")
> R:    false
> 
> Better?

Yes; the same applies to Object.prototype.toString, and probably other 
built-in methods with V8.  Actually, retaining the property attributes is 
required for a conforming implementation per ES 5.1, §8.12.5.  I should set 
up a test case as part of the ES Matrix.


PointedEars
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