Nevermind. Misread your post.
On Wed, Sep 1, 2010 at 11:24 AM, John M Bliss <[email protected]> wrote:
> > dot notation means nothing to isdefined()
>
> Um, really? The following returns "NO" for me:
>
> <cfset variables.myvar = 1>
>
> <cfoutput>#IsDefined("url.myvar")#</cfoutput>
>
>
> On Wed, Sep 1, 2010 at 11:16 AM, Russ Michaels <[email protected]>wrote:
>
>>
>> it depends how many vars you have in each scope.
>> If you have barely any then the search will be quick.
>> If you have a complex app with hundreds of vars then the result will of
>> course be different, especially if they are complex structs.
>>
>> There is also the fact that isdefined() will find the variable in ANY
>> scope,
>> which may not be the one you want.
>>
>> e.g.
>> isDefined('myvar')
>> would find
>>
>> variables.myvar
>> cookie.myvar
>> session.myvar
>>
>> etc
>> so if you are actually looking for myvar only in the form scope then this
>> could cause you issues, you also need to remember that dot notation means
>> nothing to isdefined(), so isDefined('form.myvar') could also find
>>
>> session.form.myvar
>> url.form.myvar
>> cookie.form.var
>>
>> etc
>>
>> On Wed, Sep 1, 2010 at 4:56 PM, Mark A. Kruger <[email protected]
>> >wrote:
>>
>> >
>> > Russ,
>> >
>> > You are correct about that - but it's not typically a performance
>> problem
>> > in
>> > my view. More of a "buggy/security" type problem :)
>> >
>> > -Mark
>> >
>> > Mark A. Kruger, MCSE, CFG
>> > (402) 408-3733 ext 105
>> > Skype: markakruger
>> > www.cfwebtools.com
>> > www.coldfusionmuse.com
>> > www.necfug.com
>> >
>> >
>> >
>> > -----Original Message-----
>> > From: Russ Michaels [mailto:[email protected]]
>> > Sent: Wednesday, September 01, 2010 10:51 AM
>> > To: cf-talk
>> > Subject: Re: CFParam vs. IsDefined
>> >
>> >
>> > defo better to make sure they are defined.
>> > Also using isDefined() is also bad as this search every single scope for
>> > your variable and is thus quite slow and can potentially cause timeouts.
>> > Much better to use StructKeyExists() and only test the scope your
>> variable
>> > is in.
>> >
>> > --
>> > Russ Michaels
>> > www.cfmldeveloper.com
>> > Supporting the cf community since 1999
>> > FREE ColdFusion/Railo hosting for developers.
>> >
>> >
>> > On Wed, Sep 1, 2010 at 4:40 PM, DURETTE, STEVEN J (ATTASIAIT) <
>> > [email protected]> wrote:
>> >
>> > >
>> > > Using your way ensures that any variables that you are using already
>> > > exist.
>> > >
>> > > I was always taught that I should define my variables before I use
>> them
>> > > in code (my ancient programming college courses). So, I tend to
>> follow
>> > > your method.
>> > >
>> > > Also, from a security stand, you should already know what should be
>> > > coming into your page. If it isn't there then something went wrong.
>> And
>> > > if you didn't define it and it is there you should be ignoring it.
>> > >
>> > > Steve
>> > >
>> > > -----Original Message-----
>> > > From: Michael Grant [mailto:[email protected]]
>> > > Sent: Wednesday, September 01, 2010 11:36 AM
>> > > To: cf-talk
>> > > Subject: CFParam vs. IsDefined
>> > >
>> > >
>> > > I prefer to CFParam my vars with a default value of a zero len string
>> or
>> > > a 0
>> > > for numeric values. Then I skip the isdefined and just test against
>> the
>> > > value. Well recently someone I know said that it's better to test if
>> > > it's
>> > > defined. Is there a pro or con to doing it my way vs. IsDefined ?
>> > >
>> > > Thanks.
>> > >
>> > >
>> > >
>> > >
>> > >
>> >
>> >
>> >
>> >
>>
>>
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