Task.sequentially()

[rpominov]

Same signature as in Task.parallel() but runs tasks in sequence.

[rpominov]

https://github.com/russiann/promise-sequential seems like I'm not the only one who thought about this idea :)

[danielbom]

I needed this them I build one function:

function sequenceTasks(tasks) {
  return Task.chainRec((next, done, pair) => {
    const [result, rest] = pair;

    if (rest.length === 0)
      return Task.of(done(result));

    return rest[0].map(x => next([
      result.concat(x),
      rest.slice(1)
    ]));
  }, [[], tasks]);
}