12.Answer

answerkey/applicative/12.answer.md

latest178 B

scala

def sequenceMap[K, V](ofv: Map[K, F[V]]): F[Map[K, V]] =
  ofv.foldLeft(unit(Map.empty[K, V])):
    case (acc, (k, fv)) =>
      acc.map2(fv)((m, v) => m + (k -> v))