/** Returns a subset of {@code list} containing only the items where {@code someBool == true} */
public List<MyClass> filterList(List<MyClass> list) {
  List<MyClass> ret = new List<>(list.size());
  
  for(MyClass item : list) { 
    if(item.someBool) {
        ret.add(item);
      }
    }
    
  return ret;
}