mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? threadViewPost(
    1. UThreadViewPostParentThreadViewPost value
    )?,
  2. TResult? notFoundPost(
    1. UThreadViewPostParentNotFoundPost value
    )?,
  3. TResult? blockedPost(
    1. UThreadViewPostParentBlockedPost value
    )?,
  4. TResult? unknown(
    1. UThreadViewPostParentUnknown value
    )?,
})

A variant of map that fallback to returning null.

It is equivalent to doing:

switch (sealedClass) {
  case final Subclass value:
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs TResult? mapOrNull<TResult extends Object?>({TResult? Function( UThreadViewPostParentThreadViewPost value)?  threadViewPost,TResult? Function( UThreadViewPostParentNotFoundPost value)?  notFoundPost,TResult? Function( UThreadViewPostParentBlockedPost value)?  blockedPost,TResult? Function( UThreadViewPostParentUnknown value)?  unknown,}){
final _that = this;
switch (_that) {
case UThreadViewPostParentThreadViewPost() when threadViewPost != null:
return threadViewPost(_that);case UThreadViewPostParentNotFoundPost() when notFoundPost != null:
return notFoundPost(_that);case UThreadViewPostParentBlockedPost() when blockedPost != null:
return blockedPost(_that);case UThreadViewPostParentUnknown() when unknown != null:
return unknown(_that);case _:
  return null;

}
}