emmettna

config = load_config(“root”, “1234”, “localhost”)

emmettna

final case class ConfigHost(value: String)
final case class ConfigId(value: String)
final case class ConfigPass(value: String)
def loadConfig(host: ConfigHost, id: ConfigId, pass: ConfigPass): Unit = ???

emmettna

val configHost = ???
val configId = ???
val configPass = ???
loadConfig(
  host = configHost,
  id = configId,
  pass = configPass)

emmettna

val integerSample: Int = 123
val stringInteger: String = integerSample match {
  case 123 => “123”
  case _ => “”
}

emmettna

Int integerSample = 123;
switch(integerSample){
case 123:
  "123"
  break;
  default:
  ""
}
//I'm 🤔 if it compiles

emmettna

final case class IntegerParser(value: Int)
val prasedInt = IntegerPraser(value = 1)
parsedInt match {
  case IntegerParser(value) => value.toString
  case _ => "Invalid Int"
}

emmettna

val optionValue = Option(1)
optionValue match {
  case Some(v) => ???
  case None => ???
}

emmettna

final case class DummyCaseClass(value: Int)
val dummyCaseClassOpt = Option(DummyCaseClass(1))
dummyCaseClassOpt match {
  case Some(DummyCaseClass(v)) => v.toString
  case Some(_) => ???
  case None => ???
}
// equivalent
dummyCaseClassOpt match {
  case v: Some[DummyCaseClass] => v.toString

emmettna

val list: List[Option[Int]] = List(Some(1), None, Some(2))
val result: List[Int]=list.map( numberOpt => numberOpt match {
  case Some(v) => v
  case None => 0
})

emmettna

"1,2,3".split(",").toList match {
  case first :: second :: third :: Nil => "Counting Practice"
  case _ => throw new Exception("This is not what I expected")
}