mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? emoji(
    1. ReactionTypeEmoji value
    )?,
  2. TResult? customEmoji(
    1. ReactionTypeCustomEmoji value
    )?,
  3. TResult? paid(
    1. ReactionTypePaid 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(ReactionTypeEmoji value)? emoji,
  TResult? Function(ReactionTypeCustomEmoji value)? customEmoji,
  TResult? Function(ReactionTypePaid value)? paid,
}) {
  final _that = this;
  switch (_that) {
    case ReactionTypeEmoji() when emoji != null:
      return emoji(_that);
    case ReactionTypeCustomEmoji() when customEmoji != null:
      return customEmoji(_that);
    case ReactionTypePaid() when paid != null:
      return paid(_that);
    case _:
      return null;
  }
}