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Add Task.fromEither #109

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Add Task.fromEither #109

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2 changes: 2 additions & 0 deletions lib/src/task.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,8 @@ class Task<A> implements MonadCatchOps<Task, A> {

static Task<A> failed<A>(Object err) => new Task(() => new Future.error(err));

static Task<A> fromEither<A>(Either<Object, A> e) => e.fold((l) => Task.failed<A>(l), (r) => Task.value(r));

static Task<void> sleep(Duration duration) => Task(() => Future.delayed(duration));

static Task<void> print(String s) => Task.delay(() => _consolePrint(s));
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15 changes: 15 additions & 0 deletions test/task_test.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,21 @@ void main() {
expect(result1, result2);
});

test('Task.fromEither', () async {
final taskLeft = await Task.value(1000)
.productR(Task.fromEither(left<String, int>('boom')))
.attempt()
.run();

final taskRight = await Task.fromEither(right<String, int>(42))
.replace(1000)
.attempt()
.run();

expect(taskLeft, left('boom'));
expect(taskRight, right(1000));
});

test("Task attempt", () async {
final Task<Either<Object, num>> t =
Task.delay(() => "notanumber").map(num.parse).attempt();
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