Method:  WshEnvironment.Count
object.Count ()

The Count method returns a Long value which is the number of items in the collection.

The following JScript code uses the Count method to report the number of system environment variables currently defined.

Code:
Set objShell = WScript.CreateObject("WScript.Shell")
Set objSysEnv = objShell.Environment("SYSTEM")
WScript.Echo("There are", objSysEnv.Count(), "System environment variables.")

Output:
There are 14 System environment variables.