How to check if a pathitems object exists in an open document?

[AnyON]

Hi all. 
I want to know how to check the presence
 of a pathitems object in an open 
document? 
try like this:
-- if(activeDoc.subPathItems.length != undefined){
return:
-- undefined is not an object ....

[Stephen_A_Marsh · Accepted solution]

@AnyON 

Something like this?

if(activeDocument.pathItems.length > 0){
    alert("A path exists");
} else {
    alert("No paths exist");
}

activeDocument - not activeDoc