amirkarimi

def getUser(id: Int): Future[Either[String, User]] = ???
def getCity(user: User): Future[Either[String, City]] = ???
def getCountry(city: City): Future[Either[String, Country]] = ???

def getCountryByUserId(id: Int): Future[Either[String, Country]] = {
  getUser(id) flatMap {
    case Left(err) => Future.successful(Left(err))
    case Right(user) => 
      getCity(user) flatMap {
        case Left(err) => Future.successful(Left(err))

amirkarimi

def getCountryByUserId(id: Int): Future[Either[String, Country]] = {
  val result = for {
    user <- EitherT(getUser(id))
    city <- EitherT(getCity(user))
    country <- EitherT(getCountry(city))
  } yield {
    country
  } 
  result.value
}

amirkarimi

My Useful Regular Expressions

The first lines are the regex to find and the last line are the replace expressions.

YAML

Convert single quoted values to double in YAML

:(\s?)'(.*)'

amirkarimi

[
    {
        "description": "Control+Click to Command+Click",
        "manipulators": [
            {
                "from": {
                    "modifiers": {
                        "mandatory": [
                            "control"
                        ],