execute method Null safety

List execute(
  1. List results,
  2. Map<String, dynamic> passed
)
override

Implementation

List execute(List results, Map<String, dynamic> passed) => results.length == 1
    ? results
    : results.length == 0
        ? []
        : throw FhirPathEvaluationException(
            'The List $results is only allowed to contain one '
            'item if evaluated using the .single() function',
            operation: '.single()',
            collection: results);