Future[Int] scala> val futureSum: Future[Int] = addSoon(1, 2) futureSum: scala. concurrent.Future[Int] Assertion] = scala> res0.value res1: Option[scala.util. 18 Feb 2015 In Scala you will typically use the Option[T] type, returning Some(value) when the Note that Try is not needed when working with Futures! 26 May 2015 introduced to FP and Scala - Part 2 - Scalaz Monad Transformers. Given that both Future[A] and Option[A] would be examples of monads. We've used Option as an example above because Scala's Option type is a monad, which (This will become more important when we look at Try and Future .). 7 Aug 2019 ZIO (Scala library) is still a new ecosystem that we have to integrate with other frameworks val result: Future[Option[Int]] = db.run(queryAction)�
scala> val a: Future[Option[Future[Option[List[Future[Option[String]]]]]]] = Future( None) a: scala.concurrent.Future[ scala> a.map(_.sequence) .join // like "flatten" . Future import scala.concurrent.ExecutionContext.Implicits.global val customGreeting: Future[Option[String]] = Future.successful(Some("welcome back, Lola")).
7 Mar 2014 Motivation. In real world concurrent code you often come across the Future[ Option[A]] type(where A is usually some concrete type). And then� Future[Int] scala> val futureSum: Future[Int] = addSoon(1, 2) futureSum: scala. concurrent.Future[Int] Assertion] = scala> res0.value res1: Option[scala.util. 18 Feb 2015 In Scala you will typically use the Option[T] type, returning Some(value) when the Note that Try is not needed when working with Futures! 26 May 2015 introduced to FP and Scala - Part 2 - Scalaz Monad Transformers. Given that both Future[A] and Option[A] would be examples of monads. We've used Option as an example above because Scala's Option type is a monad, which (This will become more important when we look at Try and Future .). 7 Aug 2019 ZIO (Scala library) is still a new ecosystem that we have to integrate with other frameworks val result: Future[Option[Int]] = db.run(queryAction)� Since Option[A] already implements flatten we need to make an abtract function to turn it into an abtract type. scala> import cats._, cats.data._, cats.implicits._ scala> FlatMap[Option].flatten(1.some.some) Stacking Future and Either � day 11.
23 Jan 2015 In Scala, it's easy to compose options : val oa: Option[String] = Some("a") val ob: Option[String] = Some("b") val oab : Option[String] = for{ a <- oa� import scala.concurrent.Future import scala.concurrent.ExecutionContext def f[A]( x: Option[Future[A]])(implicit ec: ExecutionContext):� 26 Apr 2016 The use of futures is prevalent in a lot of asynchronous Scala code. Oftentimes, a future can hold a value that may or may not exist and we wrap� 27 Jun 2018 In this blog, we would be looking at how map() and flatMap() operations work with Option and Future of scala, literally speaking both Futures�
18 Feb 2015 In Scala you will typically use the Option[T] type, returning Some(value) when the Note that Try is not needed when working with Futures! 26 May 2015 introduced to FP and Scala - Part 2 - Scalaz Monad Transformers. Given that both Future[A] and Option[A] would be examples of monads. We've used Option as an example above because Scala's Option type is a monad, which (This will become more important when we look at Try and Future .). 7 Aug 2019 ZIO (Scala library) is still a new ecosystem that we have to integrate with other frameworks val result: Future[Option[Int]] = db.run(queryAction)� Since Option[A] already implements flatten we need to make an abtract function to turn it into an abtract type. scala> import cats._, cats.data._, cats.implicits._ scala> FlatMap[Option].flatten(1.some.some) Stacking Future and Either � day 11. Open the file DAO.scala and add the following functions: def getLink(id: Int): Future[Option[Link]] = db.run( Links.filter(_.id === id).result.headOption ) def� 15 Jun 2018 4 Problems with Java's Exceptions and How Scala Can Help. June 15 For instance, using an Option instead of null can help to avoid NullPointerException s . def findUser(uuid: String): Future[Either[Error, Option[User]]]