🚀 go-pugleaf

you say, 

      if (app.changeGrepPreferences.pointSize=app.findGrepPreferences.pointSize)




but for comparison, you need ==, not =. There's also not much point comparing these two if you haven't set them first. And when you set them like that there's no need to compare them, if you follow me.

You need something like this:

var myFoundItem = app.findGrep (); 
   for (var i = 0; i < myFoundItem.length; i++) 
     if (myFoundItem[i].pointSize == 11 && myFoundItem[i].fontStyle == 'Italic') 
         // do something



The way you've coded the last part of the script and that you use 'myFoundItem' rather than 'myFoundItems' suggest that you don't really understand what app.findGrep () does. Before you continue to tinker with existing scripts you should take some time to learn more about JavaScript. It'll save you much time in the end.

Peter