How to know if an object is a File or a Folder ?

Hello again,
I am looking for an easy method to determine whether a File or Folder object point to an actual file or to a folder. Both objects seem to have the same set of properties, except the File element has more. But the Data Browser in the ESTK refuses to show the contents of a File object when I have not actively retrieved the properties yet. Is this simply a matter of testing whether a file-related property exists in the object? Is there another, more elegant method, an undocumented feature, for instance a property IsFolder or something similar ?
Ciao
Jang

Hi Jang,
This from Chapter 3 of the JavaScript Tools Guide:
There are several ways to distinguish between a File and a Folder object. For example:
if (f instanceof File) ...
if (typeof f.open == "undefined") ...// Folders do not open
File and Folder objects can be used anywhere that a path name is required, such as in properties and arguments for files and folders.
Rick

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