function TestException()
{
  try 
  {    
    let data = null;
    data.someProperty = "value"; //This will throw a TypeError
  } 
  catch(ex)
  {
    //Handle the exception:
    if (ex instanceof TypeError) 
      Logger.log("TypeError occurred: " + ex.message)
    else if (ex instanceof ReferenceError) 
      Logger.log("ReferenceError occurred: " + ex.message);
    else
      Logger.log("An unexpected error occurred: " + ex.message);    
  }
}


function ValidateRating(aRating) 
{
  if (typeof aRating !== "number" || aRating < 1 || aRating > 5) 
    throw "Invalid score: Score must be a number between 1 and 5.";
}


function TestRating()
{
  ValidateRating(1);
  ValidateRating(10);
}


function Recover()
{
  let url = "http://api.apis.guru/v2/list.jsonX";//Invalid end point
  let options = {
                  'method' : 'get',
                  'muteHttpExceptions': true 
                };

  RetryCount = 5;
  while (RetryCount > 0)
  {

    try 
    {
      try
      {
        var response = UrlFetchApp.fetch(url);
        var responseCode = response.getResponseCode();
        var responseBody = response.getContentText();

        if (responseCode == 200) 
          Logger.log("Successful response: " + responseBody);
        else
        {
          Logger.log("Error response code: " + responseCode);
          Logger.log("Error response body: " + responseBody);
        }
      }
      finally
      {
        RetryCount--;
      }
    } 
    catch (e) 
    {
      Logger.log("Request failed: " + e.message);
      url = "http://api.apis.guru/v2/list.json";//Valid end point
    }
  }
}