map<TResult extends Object?> method

  1. @optionalTypeArgs
TResult map<TResult extends Object?>({
  1. required TResult left(
    1. Left<L, R> value
    ),
  2. required TResult right(
    1. Right<L, R> value
    ),
})

A switch-like method, using callbacks.

Callbacks receives the raw object, upcasted. It is equivalent to doing:

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

Implementation

@optionalTypeArgs
TResult map<TResult extends Object?>({
  required TResult Function(Left<L, R> value) left,
  required TResult Function(Right<L, R> value) right,
}) {
  final _that = this;
  switch (_that) {
    case Left():
      return left(_that);
    case Right():
      return right(_that);
  }
}