Salesforce - compare values through list of objects

compareUtil

List<Sobject> sObjectList = <---provide list of Objects eg: Schools--->  
String orderBy = <---provide orderBy field Name eg: School Name--->   
String order = <--ASC or DESC--->  
  
List<Sobject> resultList = new List<Sobject>();  

Map<object, List<Sobject>> sortMap = new Map<object, List<Sobject>>();  
if(sObjectList.isEmpty() || orderBy || order) return;   
for(Sobject ob : sObjectList){  
     if(sortMap.get(ob.get(orderBy)) == null)  
          sortMap.put(ob.get(orderBy), new List<Sobject>());  
     sortMap.get(ob.get(orderBy)).add(ob);  
}      
//Sort the keys  
List<object> keys = new List<object>(sortMap.keySet());  
keys.sort();  
for(object key : keys){   
     resultList.addAll(sortMap.get(key));   
}  
//create sorted list
sObjectList.clear();  
if(order.toLowerCase() == 'ASC'){  
     for(Sobject ob : resultList){  
          sObjectList.add(ob);   
     }  
}else if(order.toLowerCase() == 'DESC'){  
     for(integer i = resultList.size()-1; i >= 0; i--){  
          sObjectList.add(resultList[i]);   
     }  
}