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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: And Another function Question
Date: Thu, 10 Dec 2015 00:26:08 +0100
Organization: PointedEars Software (PES)
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Gene Wirchenko wrote:

>      What does (contrived example follows)
>           (function(a,b,c){some_code})(1,2,3);
> mean?
> 
>      Is this to define an unnamed function with code some_code and
> then immediately call it with the parms 1,2,3?

Yes.  The proper term is “anonymous function (expression)” rather than 
“unnamed function”.
 
>      What is a good reference for this?  I am willing to put in study
> time, but I do not even know where to start.

<https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Functions#Function_expressions>

Also referred to by – you probably have guessed it – the FAQ.

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