CallFirstAndUseNext.sc

/**
 * Calling first and use next
*/

def getEmailAndAccountTuple(fNickname: Future[String]): Future[(String, Option[Long])] = 
  fNickname.flatMap(nickname => {
    val fEmailAddr = getEmailAddressByNickname(nickname)
    val fAccountInfo = getAccountInfoByNickname(nickname)
  
    fEmailAddr.flatMap(email => fAccountInfo.map(account => (email, account)))
  })

val start2: Instant = Instant.now

val fNickname: Future[String] = getNicknameById(userId)

val fUserInfo2 = for {
  nickname <- fNickname
  (email, accountInfo) <- getEmailAndAccountTuple(fNickname)
} yield UserInfo(userId, nickname, email, accountInfo)
val userInfo2 = Await.result(fUserInfo2, 10 second)

val end2: Instant = Instant.now

println(printInterval(userInfo2, start2, end2)) // UserInfo(31337,ktz,helloworld@example.com,None) take 5 seconds