old_contents: import * as connTypes from '../actions/connections';
  import * as tablesTypes from '../actions/tables';
  import * as queriesTypes from '../actions/queries';
  
  
  const INITIAL_STATE = '';
  
  
  export default function (state = INITIAL_STATE, action) {
    switch (action.type) {
    case connTypes.CONNECTION_REQUEST:
      return 'Connecting to server...';
    case connTypes.CONNECTION_SUCCESS:
      return 'Connection to server established';
    case tablesTypes.FETCH_TABLES_REQUEST:
      return 'Loading list of tables...';
    case queriesTypes.EXECUTE_QUERY_REQUEST:
      return 'Executing query...';
    default :
      return '';
    }
  }
  
new_contents: import * as connTypes from '../actions/connections';
  import * as tablesTypes from '../actions/tables';
  import * as queriesTypes from '../actions/queries';
  
  
  const INITIAL_STATE = '';
  
  
  export default function (state = INITIAL_STATE, action) {
    switch (action.type) {
    case connTypes.CONNECTION_REQUEST:
      return 'Connecting to server...';
    case connTypes.CONNECTION_SUCCESS:
      return 'Connection to server established';
    case tablesTypes.FETCH_TABLES_REQUEST:
      return 'Loading list of tables...';
    case queriesTypes.EXECUTE_QUERY_REQUEST:
      return 'Executing query...';
    default:
      return INITIAL_STATE;
    }
  }
  
subject: Use initial state variable is a status default action