off(event, handler) {
    this._handlers = this._handlers.filter((item) => {
      return item.event !== event || item.handler !== handler;
    });

    return this;
  }
/**
   * Removes all instances for the specified handler from the handler array for the named event.
   * @param {String} event
   * @param {Function} handler
   * @returns {EventEmitter}
   */
Removes all instances for the specified handler from the handler array for the named event.
@param {String} event
@param {Function} handler
@returns {EventEmitter}
Removes all instances for the specified handler from the handler array for the named event . @param { String } event @param { Function } handler @returns { EventEmitter }
off(event, handler) {
    this._handlers = this._handlers.filter((item) => {
      return item.event !== event || item.handler !== handler;
    });
    return this;
  }
off ( event , handler ) { this . _handlers = this . _handlers . filter ( ( item ) => { return item . event !== event || item . handler !== handler ; } ) ; return this ; }
Removes all instances for the specified handler from the handler array for the named event.
Removes all instances for the specified handler from the handler array for the named event .