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 UReportCreateActivityActivityQueueActivity() when queueActivity != null:
return queueActivity(_that.data);case UReportCreateActivityActivityAssignmentActivity() when assignmentActivity != null:
return assignmentActivity(_that.data);case UReportCreateActivityActivityEscalationActivity() when escalationActivity != null:
return escalationActivity(_that.data);case UReportCreateActivityActivityCloseActivity() when closeActivity != null:
return closeActivity(_that.data);case UReportCreateActivityActivityReopenActivity() when reopenActivity != null:
return reopenActivity(_that.data);case UReportCreateActivityActivityNoteActivity() when noteActivity != null:
return noteActivity(_that.data);case UReportCreateActivityActivityUnknown() when unknown != null:
return unknown(_that.data);case _:
  return null;

}
}