run a search at HOF, its a good thread to read up.
Doug
On Mon, 18 Oct 2004 13:12:35 -0700, Barney Boisvert <[EMAIL PROTECTED]> wrote:
> isDefined tries to determine if the passed string is a valid variable
> reference. structKeyExists looks for the named key in the named
> struct/scope. IsDefined, as you might imagine, performs significantly
> more work to get it's job done.
>
> structKeyExists(application, "myThing") first finds the 'application'
> variable (which happens to be a scope), and then sees if there is a
> key named 'myThing' inside.
>
> isDefined("application.myThing") has to check for 'myThing' in the
> application scope, along with 'application.myThing' in all of the
> implicit scopes (variables, url, form, cgi, maybe others).
>
> If you don't know where a varaible is, then isDefined is a must, but
> in general structKeyExists is a more efficient way to go, because you
> usually know where the variable you're checking for should live
> (application scope, in this case).
>
> The one exception is for local variables inside a function. There
> isn't a "local" scope that you can use structKeyExists against, so
> you're forced to use isDefined. Note, however, that because of the
> weird arguments/local vars setup in CFMX, if you're checking on an
> argument, you can use structKeyExists on the arguments scope and get
> the correct behaviour.
>
> cheers,
> barneyb
>
>
>
> On Mon, 18 Oct 2004 16:07:13 -0400, Johnny Le <[EMAIL PROTECTED]> wrote:
> > Hi Barney,
> >
> > That is exactly what I was looking for. I should have thought of that.
> >
> > Your code brings up another question. Is there any difference between
> structKeyExists and IsDefined? Why should someone use structKeyExists
> instead of IsDefined since IsDefined is simplier to remember?
> >
> > Johnny
> --
> Barney Boisvert
> [EMAIL PROTECTED]
> 360.319.6145
> http://www.barneyb.com/blog/
>
> I currently have 2 GMail invites for the
> taking________________________________
>
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