execute method

@override List execute(List results, Map<String, dynamic> passed)

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) => [
  results
      .map(
        (e) => e is num
            ? e
            : throw FhirPathEvaluationException(
                'sum() can only add numbers.',
                operation: 'sum',
                arguments: e,
                collection: results,
              ),
      )
      .sum,
];