Talk:Eval

message: The python section claims that python cannot evaluate statements, only functions.  Then the two example show calling eval for statements.  
What gives?
Dubwai 15:43, 29 December 2006 (UTC)
thread_title:  Python section 

message: The link "Jonathan Johnson on exposing classes to RBScript" looks suspiciously self-promotional to me. Before I included the link to Python documentation, it was the only external link in this article, and it mentions "Jonathan Johnson" as if he is some kind of Computer Science authority (reading his blog you do find out he works for the company that makes RealBasic). If you are reading this, and you agree that it is self-promotion, do erase the link.
--Ramalho 03:46, 7 April 2007 (UTC)
thread_title:  Jonathan Johnson 

message: Perhaps it would be better to demonstrate an example of using eval on a callback situation, since it's a legitimate use.
Azraell Zanella 01:11, 18 July 2007 (UTC)
thread_title:  Callback 

message: This article doesn't quite ever mention that eval and apply are related in a yin and yang fashion: in order to (eval '(f x)) your system must make the critical step (apply f x) to get the actual result.  To be clear: the code must convert the string f to a callable function f, and then must apply the callable function f to its arguments! Unfortunately, the article on apply says almost nothing about the computer-sciene meaning of this idea.linas (talk) 07:30, 23 November 2007 (UTC)
replies: text: Never mind, I added a breif paragraph. The theoretically inclined are invited to expand the article on apply. linas (talk) 18:54, 24 November 2007 (UTC)
thread_title:  [[apply]] yin and yang 

message: The mail merge example shown is unnecessarily using eval to return the contents of a string variable to the print function. Unless eval has some effect that I'm just not seeing, that code fragment is a bad example for eval use (the last line could just as easily be written as "print $template;").
This is not The Daily WTF. --Btx40 (talk) 16:44, 3 July 2008 (UTC)
thread_title:  Mail merge example 

message: typing eval( into the text field on 4chan will get you a week long ban
though it was worth mentioning  —Preceding unsigned comment added by 213.107.10.216 (talk) 22:15, 3 June 2009 (UTC)
thread_title:  4chan 

message: it takes you to the invasion board  —Preceding unsigned comment added by 204.112.224.180 (talk) 21:58, 22 February 2010 (UTC)
thread_title:  Hey 

message: JavaScript doesn't require semicolons in any code (though it's bad style to leave them off). Why make special mention of eval letting one leave off the final semicolon? Same goes for any other languages that insert missing semicolons.  —Preceding unsigned comment added by 72.174.169.239 (talk) 00:13, 3 September 2010 (UTC)
thread_title:  Do we need to mention semicolon treatment when it's not just true in eval? 

message: The link in references to D's eval function seems dead. Should be updated.  — Preceding unsigned comment added by 165.123.202.137 (talk) 18:26, 1 March 2014 (UTC)
thread_title:  Reference to D language is dead 

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thread_title:  External links modified 

message: According to this Wikipedia article, eval and apply are "instances of meta-circular evaluators." Are there any reliable sources that can verify this? Jarble (talk) 19:50, 4 November 2021 (UTC)
replies: text: Yes; they are part of the definition of what a meta-circular evaluator is, so several of the references in that article mention them, such as this one (section 4.1.1) or this other one (chapter 5). Diego (talk) 20:24, 4 November 2021 (UTC)
thread_title:  Is <code>eval</code> an example of a meta-circular evaluator? 

message: In more than 20 years of using Perl, I have found eval most useful for creating variables. I propose adding the following paragraph in the Perl section in the article.
I could add a specific example with Perl code if that would be deemed helpful.
In Perl (and perhaps other languages mentioned in this article), 
eval can be used to create Perl variables.
Ravn007 (talk) 17:36, 18 November 2021 (UTC)
thread_title:  Creating Perl variables with eval