Applicative instance for scala Future using cats

applicative-future-cats.scala

object Foo {

// based on this scalaz version: https://gist.github.com/Fristi/e7139a89e2c66d455e97

  implicit def applicativeFuture(implicit executionContext: ExecutionContext)
    = new Applicative[Future] {
    override def pure[A](x: A): Future[A] = Future.successful(x)

    override def ap[A, B](ff: Future[(A) => B])(fa: Future[A]): Future[B] =
      ff.flatMap(fa.map(_))

    override def map[A, B](fa: Future[A])(f: (A) => B): Future[B] = fa.map(f)

    override def product[A, B](fa: Future[A], fb: Future[B]): Future[(A, B)] =
      for {
        a <- fa
        b <- fb
      } yield (a, b)
  }
    
}