Wpisy z tagiem: scala

  def tooBigMethod() =
    println(".")
    println("..")
    println("...")
    println("....")
    println(".....")
    println("......")
    println(".......")
    println("........")
  end tooBigMethod

  def conditional3(answer: Int) =
    if (answer == 42)
      println("The answer to the meaning of life, the universe, and everything.")
    end if

  def conditional(x: Int) =
    if x > 0 then println("Positive")
    else println("Non-positive")

abstract class Notification

case class Email(
  sender: String,
  title: String,
  body: String
) extends Notification

case class SMS(
  caller: String,
  message: String
) extends Notification

case class VoiceRecording(
  contactName: String,
  link: String
) extends Notification

def showNotification(notification: Notification): String = {
  notification match {
    case Email(sender, title, _) =>
      s"You got an email from $sender with title: $title"
    case SMS(number, message) =>
      s"You got an SMS from $number! Message: $message"
    case VoiceRecording(name, link) =>
      s"you received a Voice Recording from $name! Click the link to hear it: $link"
  }
}

def showImportantNotification(notification: Notification, importantPeopleInfo: Seq[String]): String = {
  notification match {
    case Email(sender, _, _) if importantPeopleInfo.contains(sender) =>
      "You got an email from special someone!"
    case SMS(number, _) if importantPeopleInfo.contains(number) =>
      "You got an SMS from special someone!"
    case other =>
      showNotification(other)
  }
}

val importantPeopleInfo = Seq("867-5309", "jenny@gmail.com")

val someSms = SMS("12345", "Are you there?")
val someVoiceRecording = VoiceRecording("Tom", "voicerecording.org/id/123")
val importantEmail = Email("jenny@gmail.com", "Drinks tonight?", "I'm free after 5!")
val importantSms = SMS("867-5309", "I'm here! Where are you?")

println(showImportantNotification(someSms, importantPeopleInfo))
println(showImportantNotification(someVoiceRecording, importantPeopleInfo))
println(showImportantNotification(importantEmail, importantPeopleInfo))
println(showImportantNotification(importantSms, importantPeopleInfo))

import { multi, method } from "@arrows/multimethod"
import is from "@arrows/dispatch/is"

class Email {
  constructor(sender, title, body) {
    this.sender = sender
    this.title = title
    this.body = body
  }
}

class SMS {
  constructor(caller, message) {
    this.caller = caller
    this.message = message
  }
}

class VoiceRecording {
  constructor(contactName, link) {
    this.contactName = contactName
    this.link = link
  }
}

const showNotification = multi(
  method(
    is(Email),
    ({ sender, title }) => `You got an email from ${sender} with title: ${title}`,
  ),
  method(
    is(SMS),
    ({ caller, message }) => `You got an SMS from ${caller}! Message: ${message}`,
  ),
  method(
    is(VoiceRecording),
    ({ contactName, link }) => `You received a Voice Recording from ${contactName}! Click the link to hear it: ${link}`,
  ),
)

const showImportantNotification = multi(
  method(
    (notification, info) => is(Email)(notification) && info.includes(notification.sender),
    "You got an email from special someone!",
  ),
  method(
    (notification, info) => is(SMS)(notification) && info.includes(notification.caller),
    "You got an SMS from special someone!",
  ),
  method(showNotification),
)

const importantPeopleInfo = ["867-5309", "jenny@gmail.com"]

const someSms = new SMS("12345", "Are you there?")
const someVoiceRecording = new VoiceRecording("Tom", "voicerecording.org/id/123")
const importantSms = new SMS("867-5309", "I'm here! Where are you?")
const importantEmail = new Email("jenny@gmail.com", "Drinks tonight?", "I'm free after 5!")

console.log(showImportantNotification(someSms, importantPeopleInfo))
console.log(showImportantNotification(someVoiceRecording, importantPeopleInfo))
console.log(showImportantNotification(importantEmail, importantPeopleInfo))
console.log(showImportantNotification(importantSms, importantPeopleInfo))

> You got an SMS from 12345! Message: Are you there?
> You received a Voice Recording from Tom! Click the link to hear it: voicerecording.org/id/123
> You got an email from special someone!
> You got an SMS from special someone!

fib 0 = 0
fib 1 = 1
fib n = fib (n - 1) + fib (n - 2)

const fib = multi(
  method(0, 0),
  method(1, 1),
  method(n => fib(n - 1) + fib(n - 2))
)