Scala Future API combinators

The Scala Future API supports a couple of Scala combinators to ease the way of extracting values from a Future or a Promise object.

Let's explore some of the useful and important Scala Future API combinators in this section:

• map
• flatMap
• recover
• filter

Let's explore Scala Future API combinators with some simple examples here:

scala> import scala.concurrent.Promise
import scala.concurrent.Promise
scala> import scala.concurrent.ExecutionContext.Implicits.global
import scala.conct.ExecutionContext.Implicits.global

scala> val cityPromise = Promise[String]()
cityPromise: scala.concurrent.Promise[String] = 
scala.concurrent.impl.Promise$DefaultPromise@7d07e6aa
scala> cityPromise.success("Hyderabad")
res13: cityPromise.type = scala.concurrent.impl.Promise$DefaultPromise@7d07e6aa
scala> cityPromise.future.map { value => println(value) }
scala> cityPromise.future.map { value => println(value) }
res16: scala.concurrent.Future[Unit] = scala.concurrent.impl...