Shinpeim

// 連想配列,またはMap,またはDictionaryと呼ばれるもの
// JavaSctiptではこれをObjectと呼んでいる。
// Dictionaryの名の通り、「ある値」でそれを引くと
// それに対応する値を得ることができる。
var digits = {
  "zero": 0,
  "one": 1,
  "two": 2,
  "three": 3,
  "four": 4,

Shinpeim

function returnDouble(x){
  var result = x * 2; //引数を2倍にして
  return result;      // それを返すという関数
}

var n = 10;
var m = returnDouble(n); //returnDoubleをnを引数にして呼び出して、returnされた値を m に代入
console.log(n); // 10
console.log(m); // 20

Shinpeim

class Bento
  attr_reader :price
  attr_writer :seals

  def initialize(price)
    @price = price
    @seals = []
  end

  def discount_ammount

Shinpeim

class Nyan
  %w(a b c d).each do |meth|
    define_method(meth) do |arg|
      p arg
    end
  end
end

Shinpeim

scala> case class Nyan(a: Int, b: Int, c: Int, d: Int, e: Int, f: Int, g: Int, h: Int, i: Int, j: Int, k: Int, l: Int, m: Int, n: Int, o: Int, p: Int, q: Int, r: Int, s: Int, t: Int, u: Int, v: Int, w: Int, x: Int, y: Int, z: Int)
defined class Nyan

scala> Nyan.apply _
<console>:10: error: implementation restricts functions to 22 parameters
              Nyan.apply _

Shinpeim

class Nyan(a: String) {
  a = a + "!" // error: reassignment to val
  def b = a
}

Shinpeim

trait Tree[A]{
  def map[B](f: A => B):Tree[B]
  def forEach(f: A => Unit):Unit
}
case class Node[A](value:A, left:Tree[A], right:Tree[A]) extends Tree[A] {
  def map[B](f: A => B): Node[B] = Node(f(value), left.map(f), right.map(f))
  def forEach(f: A => Unit): Unit = {
    f(value)
    left.forEach(f)
    right.forEach(f)

Shinpeim

(function(global){
  Nyan = function(a, b){
    this.a = a;
    this.b = b;
  };

  Nyan.prototype.klass = 'Nyan'; //ださすぎ
  Nyan.prototype.nyan = function(){return this.a + this.b};
  global.Nyan = Nyan; // export

Shinpeim

(function(global){
  Nyan = function(a, b){
    this.a = a;
    this.b = b;
  };

  Nyan.prototype.klass = 'Nyan';
  Nyan.prototype.nyan = function(){return this.a + this.b};
  global.Nyan = Nyan; // export

Shinpeim

(function(global){
  Nyan = function(a, b){
    this.a = a;
    this.b = b;
  };

  Nyan.prototype.klass = 'Nyan'; // ここがクソださい
  Nyan.prototype.nyan = function(){return this.a + this.b};
  global.Nyan = Nyan; // export