IMO, any 'undefined' variable will do, as long as you know its in
scope. void is kinda ugly to me, probably damage from all the http://www.mail-archive.com/jsmentors@jsmentors.com/
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another approach is to create a function that checks if the param is
undefined and store a reference to it on to the local scope for brevity.. in
many cases it will be clearer (specially if you have multiple calls)..
function isDef(param){
//return typeof param !== 'undefined'; //if you prefer n
On Jan 12, 4:06 pm, Peter van der Zee wrote:
> For a detailed concrete parse tree see:
>
> http://esparser.qfox.nl/#runnow:on,code:void-0
>
> (hover mouse to see name of each node)
Awesome!
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Jorge.
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For a detailed concrete parse tree see:
http://esparser.qfox.nl/#runnow:on,code:void-0
(hover mouse to see name of each node)
- peter
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On Wed, Jan 12, 2011 at 4:25 AM, Peter van der Zee wrote:
> On Wed, Jan 12, 2011 at 7:07 AM, Nicholas C. Zakas > wrote:
>
>> ?To be more precise void is an operator, just typeof. The parentheses are
>> optional, just like you can write -1 or -(1), the same is true for void(0)
>> or void 0, altho
On Jan 12, 10:25 am, Peter van der Zee wrote:
> On Wed, Jan 12, 2011 at 7:07 AM, Nicholas C. Zakas
> wrote:
>
> > ?To be more precise void is an operator, just typeof. The parentheses are
> > optional, just like you can write -1 or -(1), the same is true for void(0)
> > or void 0, although white s
On Wed, Jan 12, 2011 at 7:07 AM, Nicholas C. Zakas
wrote:
> ?To be more precise void is an operator, just typeof. The parentheses are
> optional, just like you can write -1 or -(1), the same is true for void(0)
> or void 0, although white space is required when parentheses aren't there
> for void
holas
_
Nicholas C. Zakas
Twitter: @slicknet
Blog: http://www.nczonline.net/
-Original Message-
From: Michael Haufe (TNO)
Sent: Monday, January 10, 2011 12:41 PM
To: The JSMentors JavaScript Discussion Group
Subject: [JSMentors] Re: "void" function ?
On Jan 10,
On Jan 10, 11:48 am, Fran wrote:
> Hi there,
>
> I have a couple question:
>
> Why does "void(any_input)" return "undefined" ?
Because void is an operator that always returns undefined for any
valid input
> Why does "typeof void" throw an exception ?
Because void needs an argument. void is not
On Mon, Jan 10, 2011 at 7:07 PM, Angus Croll wrote:
> >>It has no decent practical use I can think of.
>
>
The only place I use it is when I want to test something in the urlbar of
the browser. If it returns anything at all, it'll navigate to the result. So
to prevent that, I `javascript:void(ex
>>It has no decent practical use I can think of.
It allows you to evaluate an expression but not be beholden to its
return value - this is occasionally useful for conditional
operations.
See this reply by Brendan Eich himself to one of my blog posts :-)
http://javascriptweblog.wordpress.com/2010
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