how to determine var existence

I would like to be able to do this:

curVarGood = 'YYYNNNY'

var lcVar = 'curVarGood'
-OR-
var lcVar = 'curVarBad'

if typeof(eval(lcVar)) == 'undefined'
lcResult = 'NNNNNNN' //var undefined
else
lcResult = eval(lcVar) //good var to process

but I get an undefined error on the first eval(), which is what I am trying
to check for.

I know the syntax above may not be exactly correct - I have tried lots of
stuff.

I just need to know the correct commands.

Thanks.....KM

"Ken Murphy" <ken (AT) murphysoftware (DOT) net> kirjoitti
viestissä:4-ydnak95fbGLvbenZ2dnUVZ_t2dnZ2d (AT) comcast (DOT) com...

I would like to be able to do this:

curVarGood = 'YYYNNNY'

var lcVar = 'curVarGood'
-OR-
var lcVar = 'curVarBad'

if typeof(eval(lcVar)) == 'undefined'
lcResult = 'NNNNNNN' //var undefined
else
lcResult = eval(lcVar) //good var to process

but I get an undefined error on the first eval(), which is what I am
trying to check for.

I know the syntax above may not be exactly correct - I have tried lots of
stuff.

I just need to know the correct commands.

I'd suggest something like this:

try {
lcResult = eval(lcVar);
} catch(e) {
lcResult = 'NNNNNNN';
}



--
SETI @ Home - Donate your cpu's idle time to science.
Further reading at <http://setiweb.ssl.berkeley.edu/>
Kimmo Laine <antaatulla.sikanautaa (AT) gmail (DOT) com.NOSPAM.invalid>

On 2005-11-05, Kimmo Laine <antaatulla.sikanautaa (AT) gmail (DOT) com.NOSPAM.invalid> wrote:

"Ken Murphy" <ken (AT) murphysoftware (DOT) net> kirjoitti
viestissä:4-ydnak95fbGLvbenZ2dnUVZ_t2dnZ2d (AT) comcast (DOT) com...
I would like to be able to do this:

curVarGood = 'YYYNNNY'

var lcVar = 'curVarGood'
-OR-
var lcVar = 'curVarBad'

if typeof(eval(lcVar)) == 'undefined'
lcResult = 'NNNNNNN' //var undefined
else
lcResult = eval(lcVar) //good var to process

try it inside-out. like this.

if( eval("typeof("+lcVar+")") == 'undefined' )


etc.


Bye.
Jasen