Scraper for Twitter followers count

settings.gs

// Aggregating Consts Object
function Settings() {
  
  // defined col datas
  this.COL_TW_ID_NUM = 1;
  this.COL_TW_URL_NUM = 2;
  this.COL_TW_FOLLOWER_NUM = 3;

  // defined start row numbers 
  this.START_ROW_NUM = 2;
}

Settings = new Settings();

twitterScraper.gs

function getTwitterFollowers () {
  var book = SpreadsheetApp.getActiveSpreadsheet();
  var sheetData = book.getSheetByName('sheet1');
  
  var rowStartData = Settings.START_ROW_NUM;
  var rowEndData = sheetData.getDataRange().getLastRow(); 
  
  for (var i = rowStartData; i <= rowEndData; i += 1) {
    twitterId = sheetData.getRange(i, Settings.COL_TW_ID_NUM).getValue();
    
    twitterClient = new TwitterClient(twitterId);
    result = twitterClient.getFollowerCount();
    
    sheetData.getRange(i, Settings.COL_TW_URL_NUM).setValue(result.twitterUrl);
    sheetData.getRange(i, Settings.COL_TW_FOLLOWER_NUM).setValue(result.followers);
  }
}

// Object: TwitterClient
//
// @param [String] twitterId
function TwitterClient(twitterId){
  this.twitterId = twitterId;
  this.html = '';
  
  // Get Followers Count
  // 
  // @return [Object]
  this.getFollowerCount = function() {
    var response = this._request();
    return { 'twitterUrl': this._generateTwitterUrl(), 'followers':this._parseFollowersCount(response) };
  }
  
  // Parsing Followers Count from Response
  //
  // @param [String] response
  // @return [String]
  this._parseFollowersCount = function(response) {
    var indexNum = response.indexOf(this._searchStr());
    
    //Logger.log(indexNum);
    
    if (indexNum == -1) { return ''; }
    
    var htmlBlock = response.substring(indexNum);
    var indexNum = htmlBlock.indexOf('</a>');
    
    if (indexNum == -1) { return ''; }
      
    var htmlBlock = htmlBlock.substring(0, indexNum + 4);
    var numPattern = new RegExp(/\b\d{1,3}(,\d{3})*\b/);
    
    return numPattern.exec(htmlBlock)[0];
  }
 
  // @return [String]
  this._request = function(){
    var response = UrlFetchApp.fetch(this._generateTwitterUrl());
    return response.getContentText('UTF-8');
  }

  // @return [String]  
  this._searchStr = function(){
    return '<a href="/' + this.twitterId + '/followers"';
  }
  
  // @return [String]   
  this._generateTwitterUrl = function() {
    return 'https://twitter.com/' + this.twitterId;
  }
  
}