hasroleonly - how to check if a given user has a specific role only and no other roles

[VaranAwesomenow]

How to find out if a user has a specific role and only that role.

This function takes role name and user sys_id as checks if the user has only that role and no other roles. It returns response as true / false.

True = if user only has the specified role

Fast = if user has no role or any other roles or more than one role.

function hasRoleOnly(roleName, userId) {
var returnBol = false;
var roleList = getAllRoles(userId);
if (roleList.length() > 1 || roleList.length == 0 || JSUtil.nil(roleList)) {
returnBol = false;
}
if (roleList.length == 1) {
if (roleName == roleList[0]) {
returnBol = true;
}
}
return returnBol;
}

function getAllRoles(userId) {
var roleList = [];
var grUserRole = new GlideRecord('sys_user_has_role');
var query = 'user=' + userId;
grUserRole.addEncodedQuery(query);
grUserRole.query();
while (grUserRole.next()) {
roleList.push(grUserRole.role.name);
}
return roleList;
}

References : User Object Cheat Sheet - ServiceNow Guru