getSubField method
Implementation
SubField? getSubField({String? name, int? index}) {
if (index != null && index >= 0 && index < subFields.length) {
return subFields[index];
}
if (name != null) {
for (var subField in subFields) {
if (subField.name == name) {
return subField;
}
}
}
return null;
}