whenOrNull<TResult extends Object?> method

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

}
}