whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? $default(String $type, String code, String name, @ProfileViewBasicConverter() ProfileViewBasic owner, int memberCount, int memberLimit, bool requireApproval, @JoinRuleConverter() JoinRule joinRule, @LinkEnabledStatusConverter() LinkEnabledStatus enabledStatus, @ConvoViewConverter() ConvoView? convo, @JoinLinkViewerStateConverter() JoinLinkViewerState? viewer, 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( String $type,  String code,  String name, @ProfileViewBasicConverter()  ProfileViewBasic owner,  int memberCount,  int memberLimit,  bool requireApproval, @JoinRuleConverter()  JoinRule joinRule, @LinkEnabledStatusConverter()  LinkEnabledStatus enabledStatus, @ConvoViewConverter()  ConvoView? convo, @JoinLinkViewerStateConverter()  JoinLinkViewerState? viewer,  Map<String, dynamic>? $unknown)?  $default,) {final _that = this;
switch (_that) {
case _JoinLinkPreviewView() when $default != null:
return $default(_that.$type,_that.code,_that.name,_that.owner,_that.memberCount,_that.memberLimit,_that.requireApproval,_that.joinRule,_that.enabledStatus,_that.convo,_that.viewer,_that.$unknown);case _:
  return null;

}
}