function(){
  return function getFromDataLayer(keyToObtain, eventValueToFilter, expectedValue){
    var result = undefined;
    try{
      var events = window.dataLayer.filter( 
        function(e){
          var isEvent = true;
          var isExpectedValue = true;
          var value = e[keyToObtain];
          if(eventValueToFilter != undefined){
            isEvent = e['event'] === eventValueToFilter;
          }
          if(expectedValue != undefined){
            isExpectedValue = value === expectedValue
          }
          return isEvent && isExpectedValue && value != undefined;
        });
      if(events.length > 0){
        result = events.pop()[keyToObtain];
      }
    }catch(e){}
    return result;
  }
}