whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? queueActivity(
    1. QueueActivity data
    )?,
  2. TResult? assignmentActivity(
    1. AssignmentActivity data
    )?,
  3. TResult? escalationActivity(
    1. EscalationActivity data
    )?,
  4. TResult? closeActivity(
    1. CloseActivity data
    )?,
  5. TResult? reopenActivity(
    1. ReopenActivity data
    )?,
  6. TResult? noteActivity(
    1. NoteActivity data
    )?,
  7. TResult? unknown(
    1. Map<String, dynamic> data
    )?,
})

A variant of when that fallback to returning null

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>({TResult? Function( QueueActivity data)?  queueActivity,TResult? Function( AssignmentActivity data)?  assignmentActivity,TResult? Function( EscalationActivity data)?  escalationActivity,TResult? Function( CloseActivity data)?  closeActivity,TResult? Function( ReopenActivity data)?  reopenActivity,TResult? Function( NoteActivity data)?  noteActivity,TResult? Function( Map<String, dynamic> data)?  unknown,}) {final _that = this;
switch (_that) {
case UReportActivityViewActivityQueueActivity() when queueActivity != null:
return queueActivity(_that.data);case UReportActivityViewActivityAssignmentActivity() when assignmentActivity != null:
return assignmentActivity(_that.data);case UReportActivityViewActivityEscalationActivity() when escalationActivity != null:
return escalationActivity(_that.data);case UReportActivityViewActivityCloseActivity() when closeActivity != null:
return closeActivity(_that.data);case UReportActivityViewActivityReopenActivity() when reopenActivity != null:
return reopenActivity(_that.data);case UReportActivityViewActivityNoteActivity() when noteActivity != null:
return noteActivity(_that.data);case UReportActivityViewActivityUnknown() when unknown != null:
return unknown(_that.data);case _:
  return null;

}
}