Is there a recommended way to catch undefined parameters in a function?

[jaloren28]

I was working on a script that had a function which recursively called itself. At one point the function had one parameter but eventually I added a second parameter. Unfortunately, i forgot to initialize the second parameter when i recursively called the function within the function. In the extendscript toolkit, this meant that when I hit the part of the function that required the parameter, it would throw an error "object is undefined" without telling me what the object was so I didn't know the issue was the uninitalized parameter. I wish the toolkit was robust enough to instead throw an error like "parameter [name of parameter] is undefined in function [name of function]". That would have immediately told me what was going on.

So is there some way to define a custom function or some test i could add in that would catch the unitialized parameter problem? The one thought i had was to always put an ObjectValid test on the parameters at the beginning of the function like so:

function foobar (parameter1, parameter2)

{ var vFunctionName=foobar;

if (parameter1.ObjectValid()&&parameter2.ObjectValid())

      { // execute code here

       } else {Err(foobar.name+' has an unitialized parameter')}

}

[jaloren28]

Or i could do this, I suppose:

function foobar (parameter1, parameter2)

{

     if (parameter1!=undefined&&parameter2!=undefined)

     { // execute code here

       }

  }  else {Err(foobar.name+' has an unitialized parameter.')}

}

[jaloren28]

Or a different way would to be test that the number of arguments passed in is equivalent to the number of arguments declared in the function. Here's the test:

function createBookList(pFolder,pBookArray)

{   

     var vFunctionArgs=createBookList.length;

     var args = [].slice.call(arguments);

     if (vFunctionArgs==args.length){$.writeln ('the number of parameters passed in MATCHES the parameters declared in the function')}

     else {$.writeln('the number of parameters passed in do NOT match the parameters declared in the function ')}

}