Question

I want to check whether string is empty or not

when i create object=Shared.getLocal("abc");

it assigns undefinded to the object at the first time

 if(object.data.name=="undefnied") {
         // is this correct   
 }   

Answer 1

Use the hasOwnProperty function to test if the variable exists. For example:

    if ( object.data.hasOwnProperty("name") ){
        // Ok. object.data.name exists...
        var value_of_name : String = String(object.data["name"]);

        // Check for non-null, non-empty
        if ( value_of_name ){
             // Ok. It is a non-null, non-empty string
             // ...
        }
     }