How to query a certain user's role

Hello Community,

I have a question.   I am trying to query a certain role and return a true statement when a user has that certain role.   What am I doing wrong?

Here is the script I am trying to work with

function userHasRole(UserID, role){ 
var roles = new GlideRecord('sys_user_has_role');
     
roles.addQuery('user', userID);     
roles.addQuery('role.name', change_manager);
roles.query();
     
if (roles == change_manager){
         return 'true';
         }
return 'false';
}

Also you can have a function within a function right?   Here is the whole code I am working on:

answer = ifScript();
           function ifScript() {
                 //answer = 'false';
   var userID = gs.getUserID();
     
   gs.log("work start check for " + userID + " assigned_to " + current.assigned_to);
     if (userID == current.assigned_to) {
     return 'true'; }
     
     // query to see if userID has role change management, if so return true
     function userHasRole(UserID, role){ 
     var roles = new GlideRecord('sys_user_has_role');
     
     roles.addQuery('user', userID); 
     roles.addQuery('role.name', change_manager);
     roles.query();
     
     if (roles == change_manager){
     return 'true';
   }
     }
}
   return 'false';

Thanks in advanced.