Java script has many falsy values as I started learning. I have a program that gets values from a service and loads into an array like this:

function loadNames() {

    Global.names = // what should I use here? undefined, null, , 0, {} or anything else

    var lnames = getLNames(); // this is doing some magic

        if ( lnames.length !== 0 ) {

            Global.names = new Array();

            for ( var i = 0; i < lnames.length; ++i)

                Global.names[i] = lnames[i];

    }

}

I want to know the right way of resetting Global.names. What is most appropriate here? In code I only want to check like if ( Global.names )

PS: I can't just take the return value into Global.names as the returned object is destroyed later. Hence, I need to do a deep copy

Thanks