whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. ChatPreference? chat,
    2. FilterablePreference? follow,
    3. FilterablePreference? like,
    4. FilterablePreference? likeViaRepost,
    5. FilterablePreference? mention,
    6. FilterablePreference? quote,
    7. FilterablePreference? reply,
    8. FilterablePreference? repost,
    9. FilterablePreference? repostViaRepost,
    10. Preference? starterpackJoined,
    11. Preference? subscribedPost,
    12. Preference? unverified,
    13. Preference? verified,
    14. Map<String, dynamic>? $unknown,
    )?
)

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(@ChatPreferenceConverter()  ChatPreference? chat, @FilterablePreferenceConverter()  FilterablePreference? follow, @FilterablePreferenceConverter()  FilterablePreference? like, @FilterablePreferenceConverter()  FilterablePreference? likeViaRepost, @FilterablePreferenceConverter()  FilterablePreference? mention, @FilterablePreferenceConverter()  FilterablePreference? quote, @FilterablePreferenceConverter()  FilterablePreference? reply, @FilterablePreferenceConverter()  FilterablePreference? repost, @FilterablePreferenceConverter()  FilterablePreference? repostViaRepost, @PreferenceConverter()  Preference? starterpackJoined, @PreferenceConverter()  Preference? subscribedPost, @PreferenceConverter()  Preference? unverified, @PreferenceConverter()  Preference? verified,  Map<String, dynamic>? $unknown)?  $default,) {final _that = this;
switch (_that) {
case _NotificationPutPreferencesV2Input() when $default != null:
return $default(_that.chat,_that.follow,_that.like,_that.likeViaRepost,_that.mention,_that.quote,_that.reply,_that.repost,_that.repostViaRepost,_that.starterpackJoined,_that.subscribedPost,_that.unverified,_that.verified,_that.$unknown);case _:
  return null;

}
}