AlternativeFutureExample.scala and WontCompileFutureExample.scala

AlternativeFutureExample.scala

import scala.concurrent.{ExecutionContext, Future}

object AlternativeFutureExample {
  def foobar(implicit ec: ExecutionContext): Future[String] = {
    for {
      f <- Future.failed(new RuntimeException("Foo"))
    } yield {
      f
    }
  } recover {
    case _: RuntimeException => "Bar"
  }
}

WontCompileFutureExample.scala

import scala.concurrent.{ExecutionContext, Future}

object WontCompileFutureExample {
  def foobar(implicit ec: ExecutionContext): Future[String] = {
    for {
      f <- Future.failed(new RuntimeException("Foo"))
    } yield {
      f
    } recover {
      case _: RuntimeException => "Bar"
    }
  }
}

Also see original: https://gist.github.com/mattroberts297/7969634d981b920a492617dbf7ed747d