maybeMap<TResult extends Object?> method

  1. @optionalTypeArgs
TResult maybeMap<TResult extends Object?>({
  1. TResult solid(
    1. BackgroundFillSolid value
    )?,
  2. TResult gradient(
    1. BackgroundFillGradient value
    )?,
  3. TResult freeformGradient(
    1. BackgroundFillFreeformGradient value
    )?,
  4. required TResult orElse(),
})

A variant of map that fallback to returning orElse.

It is equivalent to doing:

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

Implementation

@optionalTypeArgs
TResult maybeMap<TResult extends Object?>({
  TResult Function(BackgroundFillSolid value)? solid,
  TResult Function(BackgroundFillGradient value)? gradient,
  TResult Function(BackgroundFillFreeformGradient value)? freeformGradient,
  required TResult orElse(),
}) {
  final _that = this;
  switch (_that) {
    case BackgroundFillSolid() when solid != null:
      return solid(_that);
    case BackgroundFillGradient() when gradient != null:
      return gradient(_that);
    case BackgroundFillFreeformGradient() when freeformGradient != null:
      return freeformGradient(_that);
    case _:
      return orElse();
  }
}