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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: setInterval
Date: Tue, 07 Feb 2017 04:36:11 +0100
Organization: PointedEars Software (PES)
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Ben Bacarisse wrote:

> jonas.thornvall@gmail.com writes:
> <snip>
>>> > > > > >   var interval_1 = setInterval("COUNTDOWN();",1000);
>>> […]
>>> > > > > >  if(mycount<1) clearInterval(interval_1);
>>> […]
>> Well it work but
> 
> I'm surprised that works.  The first argument of setInterval should be a
> function not a string.

The string argument is historic because there were no function expressions 
when this method was introduced in Netscape 2.0, JavaScript 1.0 (since 
JavaScript 1.4 it is no longer part of the programming language, but of the 
language-independent Window API).

And yes, it is better to use a Function instance reference, for two reasons:

  1. it is safer: nobody can replace the function to be called and have it
     executed instead;

  2. it is more efficient: this is a kind of “hidden eval()” (IIRC that was 
     the term used)

-- 
PointedEars
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