haru01

@@ -6,14 +6,3 @@ function generateReadedReport(readedList, recommendList) {
   for (let readedBook of readedList.books) {
-    let currentPoint = 0;
-    if (readedBook.times === 0) {
-      currentPoint = 0;
-    } else if (!recommendList.map(recommend => recommend.asin).includes(readedBook.asin)) {
-      currentPoint = 1;
-    } else if (readedBook.times === 1) {
-      currentPoint = 3;
-    } else if (readedBook.times === 2) {

haru01

{
  "testRegex": ".*-test\\.js$",
  "testEnvironment": "node"
}

haru01

const randomDiceTotal = () => {
  const first = Math.floor(Math.random() * 6) + 1
  const second = Math.floor(Math.random() * 6) + 1
  return first + second
}

const createJugeChoHan = (diceTotal = randomDiceTotal) => (players) => {
  const choHan = { 0: '丁', 1: '半' }[diceTotal() % 2]

  return players.map((player) => {

haru01

const randomDiceTotal = () => {
  const first = Math.floor(Math.random() * 6) + 1
  const second = Math.floor(Math.random() * 6) + 1
  return first + second
}

const judgeChoHan = (players, diceTotal = randomDiceTotal) => {
  const choHan = { 0: '丁', 1: '半' }[diceTotal() % 2]

  return players.map((player) => {

haru01

const randomDiceTotal = () => {
  const first = Math.floor(Math.random() * 6) + 1
  const second = Math.floor(Math.random() * 6) + 1
  return first + second
}

class ChoHan {
  // コンストラクタ インジェクションで差し替え可能
  constructor(diceTotal = randomDiceTotal) {
    this.diceTotal = diceTotal

haru01

class ChoHan {
  judge(players) {
    const choHan = { 0: '丁', 1: '半' }[this._total() % 2]

    return players.map((player) => {
      if (player.choHan === choHan) {
        return { ...player, result: 'win' }
      } else {
        return { ...player, result: 'lose' }
      }

haru01

class ChoHan {
  // ランダムな振る舞いをするメソッドと
  judge(players) {
    const first = Math.floor(Math.random() * 6) + 1
    const second = Math.floor(Math.random() * 6) + 1
    return this._judge(players, first + second)
  }

  // ランダムな振る舞いしないメソッドに分離し、引数でコントロール
  _judge(players, total) {

haru01

class ChoHan {
  judge(players) {
    // ２つのサイコロがランダムで、テストを難しくしている箇所。 どうやって分離する？
    const first = Math.floor(Math.random() * 6) + 1
    const second = Math.floor(Math.random() * 6) + 1
    const choHan = { 0: '丁', 1: '半' }[(first + second) % 2]

    return players.map((player) => {
      if (player.choHan === choHan) {
        return { ...player, result: 'win' }

haru01

inc = (n) => n + 1
inc(2)
square = (n) => n * n
[1,2,3].map(inc)       // [ 2, 3, 4 ]
[1,2,3].map(square)    // [ 1, 4, 9 ]

compose = (...fns) => x => fns.reduceRight((v, f) => f(v), x);
incSquare = compose(inc, square)
incSquare(3)          // 10

haru01

import xs from 'xstream';
import delay from 'xstream/extra/delay';

const humanCProx = xs.create();
const humanA = humanCProx.map(increment).compose(delay(100));
const humanB = humanA.map(increment).compose(delay(100));
const humanC = humanB.map(increment).startWith(1).compose(delay(100));
humanCProx.imitate(humanC);

function increment(n) {