Can we check to see whether or not a local variable exists, without throwing an error if it does not?

I.e., say we have a script with the local variable: object.

If I put:

if(TypeOf(object) = null){
  return(false)
}
else{
  return(true)
}

... it throws an error if object does not exist.

Error running script: Error compiling expression 'TypeOf(object)': Unknown object or variable 'object'

...but, if i create object setting it to null, it works:

object = null
msg(TypeOf(object))

NOTE: I can check for an attribute on an object with TypeOf(), and it will return null if the attribute has never been created at all.

Anyhoo, I think I read through all the docs and threads concerning this, and I've found no way to get around a local variable which has never existed inside the script.

Anyone know a trick?

if (IsDefined("object")) {
  msg ("'object' is a "+TypeOf(object))
}
else {
  msg ("There's no variable 'object'")
}

Hello, mrangel!

I already tried that one:

if (not IsDefined(object)) {
  msg ("object does not exist")
}

Error running script: Error compiling expression 'not IsDefined(object)': Unknown object or variable 'object'

I never thought of using quotation marks, though. That works!

Thank you!!!

Yeah, IsDefined takes a string, the name of a variable. It can't take a direct variable as its argument, because the "unknown variable" error is generated before it attempts to run the function.