Arakaki

def block_sample
  puts 'start up'

  yield if block_given?

  puts 'sit down'
end

block_sample

Arakaki

languages = %w(Perl Python Ruby Smalltalk JavaScript)

languages.each do |language|
  puts language

  if language == 'Ruby'
    puts 'I found Ruby!!'
    break
  end
end

Arakaki

for name in %w(Alice Bob Carol)
  puts name
end

for val in {a: 1, b: 2}
  puts val[0]
  puts val[1]
end

for key, val in {a: 1, b: 2}

Arakaki

languages = %w(Perl Python Ruby)
i=0

while i < languages.length
  puts "Hello, #{languages[i]}."
  i += 1
end


i = languages.length - 1

Arakaki

stone ="ruby"

case stone
  when 'ruby'
    puts '7月'
  when 'peridot','sardonyx'
    puts '8月'
  else
    puts 'よくわかりません'
end

Arakaki

n = 0
puts '0でした' if n.zero?
puts '0ではありませんでした' unless n.zero?

Arakaki

class MyObject
  def ==(other)
    self.class == other.class
  end
end

result = MyObject.new == MyObject.new
puts result

Arakaki

package com.mycode


object App {
  def main(args : Array[String]) {
    trait SentientBeing
    trait Animal extends SentientBeing
    case class Dog(name: String) extends Animal
    case class Person(name: String, age: Int) extends SentientBeing

Arakaki

package com.mycode

case class Person(name :String)

object App {
  def main(args : Array[String]) {
    def speak(p: Person) = p match {
      case Person(name) if name == "Fred" => println("Yubba dubba doo")
      case _ => println("Watch the Flintstones!")
    }

Arakaki

package com.mycode

trait Animal
case class Dog(name: String) extends Animal
case class Cat(name: String) extends Animal
case object Woodpecker extends Animal

object App {
  def main(args : Array[String]) {
    def determineType(x: Animal): String = x match {