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What does this operator ">-" stand for or mean, as in...


this.ver = navigator.appVersion;

this.agent = navigator.userAgent;

this.dom = document.getElementById ? 1 : 0;

this.opera5 = this.agent.indexOf("Opera 5") >- 1;

I'm sort of a nOOb any help would much appreciated

On 25/03/2006 23:15, DoomedLung wrote:

> What does this operator ">-" stand for or mean, as in...

[snip]

> this.dom = document.getElementById ? 1 : 0;

If this code must be used at all,

this.dom = !!document.getElementById;

would be better. See below, though.

> this.opera5 = this.agent.indexOf("Opera 5") >- 1;

It is, in fact, two separate operators. The greater-than relational
operator, and the unary negation operator. The code would act the same
(and be more readable) if it were written:

this.opera5 = this.agent.indexOf('Opera 5') > -1;

> I'm sort of a nOOb any help would much appreciated

Then some very useful advice would be to avoid this code altogether.
Browser detection is flawed and unreliable. Use feature detection instead.

<http://www.jibbering.com/faq/faq_notes/not_browser_detect.html>

Mike

--
Michael Winter
Prefix subject with [News] before replying by e-mail.

Cheers for the advice and the link it makes sense now! Thanks

JRS: In article < .com>
, dated Sat, 25 Mar 2006 15:15:39 remote, seen in
news:comp.lang.javascript, DoomedLung <>
posted :
>What does this operator ">-" stand for or mean, as in...
>
>
>this.ver = navigator.appVersion;
>
>this.agent = navigator.userAgent;
>
>this.dom = document.getElementById ? 1 : 0;
>
>this.opera5 = this.agent.indexOf("Opera 5") >- 1;
>
>I'm sort of a nOOb any help would much appreciated

It means that the author is a careless typist, who meant (one supposes)
... > -1 ;

The previous line means that the author does not understand Booleans.

The whole suggests that the application is unusual or the author is
ignorant; or both.

The first line ...


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Cheers again!