execute method
The iterable, nested function that evaluates the entire FHIRPath expression one object at a time
Implementation
@override
List execute(List results, Map<String, dynamic> passed) {
final executedValue = value.execute(results.toList(), passed);
final finalResults = [];
finalResults
..addAll(results.where((r) => notFoundInList(finalResults, r)))
..addAll(executedValue.where((v) => notFoundInList(finalResults, v)));
return finalResults;
}