function processData(data) {
  try {
    if (!data) {
      throw new TypeError('Data is missing');
    }
    
    const result = data.process();
    return result;
  } catch (error) {
    console.log(error instanceof ReferenceError ? 1 :
               error instanceof TypeError ? 2 :
               error instanceof SyntaxError ? 3 : 4);
  }
}

processData(null);