when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>({
  1. required TResult joinLinkPreviewView(
    1. JoinLinkPreviewView data
    ),
  2. required TResult disabledJoinLinkPreviewView(
    1. DisabledJoinLinkPreviewView data
    ),
  3. required TResult invalidJoinLinkPreviewView(
    1. InvalidJoinLinkPreviewView data
    ),
  4. required TResult unknown(
    1. Map<String, dynamic> data
    ),
})

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs TResult when<TResult extends Object?>({required TResult Function( JoinLinkPreviewView data)  joinLinkPreviewView,required TResult Function( DisabledJoinLinkPreviewView data)  disabledJoinLinkPreviewView,required TResult Function( InvalidJoinLinkPreviewView data)  invalidJoinLinkPreviewView,required TResult Function( Map<String, dynamic> data)  unknown,}) {final _that = this;
switch (_that) {
case UGroupGetJoinLinkPreviewsJoinLinkPreviewsJoinLinkPreviewView():
return joinLinkPreviewView(_that.data);case UGroupGetJoinLinkPreviewsJoinLinkPreviewsDisabledJoinLinkPreviewView():
return disabledJoinLinkPreviewView(_that.data);case UGroupGetJoinLinkPreviewsJoinLinkPreviewsInvalidJoinLinkPreviewView():
return invalidJoinLinkPreviewView(_that.data);case UGroupGetJoinLinkPreviewsJoinLinkPreviewsUnknown():
return unknown(_that.data);}
}