whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? blocking(
    1. ModerationCauseBlocking data
    )?,
  2. TResult? blockedBy(
    1. ModerationCauseBlockedBy data
    )?,
  3. TResult? blockOther(
    1. ModerationCauseBlockOther data
    )?,
  4. TResult? label(
    1. ModerationCauseLabel data
    )?,
  5. TResult? muted(
    1. ModerationCauseMuted data
    )?,
  6. TResult? muteWord(
    1. ModerationCauseMuteWord data
    )?,
  7. TResult? hidden(
    1. ModerationCauseHidden 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( ModerationCauseBlocking data)?  blocking,TResult? Function( ModerationCauseBlockedBy data)?  blockedBy,TResult? Function( ModerationCauseBlockOther data)?  blockOther,TResult? Function( ModerationCauseLabel data)?  label,TResult? Function( ModerationCauseMuted data)?  muted,TResult? Function( ModerationCauseMuteWord data)?  muteWord,TResult? Function( ModerationCauseHidden data)?  hidden,}) {final _that = this;
switch (_that) {
case UModerationCauseBlocking() when blocking != null:
return blocking(_that.data);case UModerationCauseBlockedBy() when blockedBy != null:
return blockedBy(_that.data);case UModerationCauseBlockOther() when blockOther != null:
return blockOther(_that.data);case UModerationCauseLabel() when label != null:
return label(_that.data);case UModerationCauseMuted() when muted != null:
return muted(_that.data);case UModerationCauseMuteWord() when muteWord != null:
return muteWord(_that.data);case UModerationCauseHidden() when hidden != null:
return hidden(_that.data);case _:
  return null;

}
}