ServiceNow config exceptions business rule

(function executeRule(current, previous /*null when async*/) {

    var maProperty = 'cmdb.managed_attributes.' + current.sys_class_name.toString(); //get managed attributes property
    var fieldsArray = gs.getProperty(maProperty).split(','); //convert comma separated attributes string into an array
    var oldValues = ''; //used for populating previous (old) values
    var newValues = ''; //used for populating current (new) values
    var configExc = false;

    for(var i = 0; i < fieldsArray.length; i++) {
        if(previous[fieldsArray[i]] != current[fieldsArray[i]]){ //check if the value of current element is changed
            configExc = true; //one of the managed attributes is changed, so we need a config exception record
            oldValues += current[fieldsArray[i]].getLabel() + ': '+ previous[fieldsArray[i]].getDisplayValue() + '\n';
            newValues += current[fieldsArray[i]].getLabel() + ': '+ current[fieldsArray[i]].getDisplayValue() + '\n';
        }
    }

    if(configExc){ //only create a config exception record if one of the managed attributes is changed
        var type = previous.install_status == "" ? "new_ci" : "ci";
        var gr = new GlideRecord('u_config_exceptions');
        gr.initialize();
        gr.u_ci_name = current.sys_id;
        gr.u_type = type;
        gr.u_old_values = oldValues;
        gr.u_new_values = newValues;
        gr.insert();
    }

})(current, previous);