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Add Try to Do notation #151

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Add Try to Do notation #151

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16 changes: 16 additions & 0 deletions packages/fpdart/lib/src/task_either.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,22 @@ final class TaskEither<L, R> extends HKT2<_TaskEitherHKT, L, R>
}
});

/// Initialize a **Try to Do Notation** chain.
// ignore: non_constant_identifier_names
factory TaskEither.TryToDo(
DoFunctionTaskEither<L, R> f,
L Function(Object error, StackTrace stackTrace) onError,
) =>
TaskEither(() async {
try {
return Either.of(await f(_doAdapter<L>()));
} on _TaskEitherThrow<L> catch (e) {
return Either.left(e.value);
} catch (error, stack) {
return Left<L, R>(onError(error, stack));
}
});

/// Used to chain multiple functions that return a [TaskEither].
///
/// You can extract the value of every [Right] in the chain without
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