{{appName}}

scala.util.Try

import scala.util.Try
import java.net.URL
def parseURL(url: String): Try[URL] =
    Try(new URL(url))

scala> parseURL("https://www.salesforce.com").isSuccess
res6: Boolean = true

scala> parseURL("222").isSuccess
res4: Boolean = false
         

• Guide to Scala
• Std lib

Option

• Represents optional values. Instances of Option are either an instance of scala.Some or the object None.

val greeting: Option[String] = Some("Hello world")
val greeting: Option[String] = None

case class User(
  id: Int,
  firstName: String,
  lastName: String,
  age: Int,
  gender: Option[String])

object UserRepository {
  private val users = Map(1 -> User(1, "John", "Doe", 32, Some("male")),
                          2 -> User(2, "Johanna", "Doe", 30, None))

  def findById(id: Int): Option[User] = users.get(id)
  def findAll = users.values
}
  

Option - contd.

  scala> if (user1.isDefined) {
   |   println(user1.get.firstName)
   | }
   John

   scala> val user = User(2, "Johanna", "Doe", 30, None)
  user: User = User(2,Johanna,Doe,30,None)

  scala> println("Gender: " + user.gender.getOrElse("not specified"))
  Gender: not specified


  scala> val user = User(2, "Johanna", "Doe", 30, None)
  user: User = User(2,Johanna,Doe,30,None)

  scala> val gender = user.gender match {
       |   case Some(gender) => gender
       |   case None => "not specified"
       | }
  gender: String = not specified

  scala> println("Gender: " + gender)
  Gender: not specified

    

• Guide to Scala