haru01

  let result = 0;
  [1,2,3,4,5,6].forEach((n) => {
    if (n % 2 === 0) {
      result += n * n;
    }
  });
  console.log(result);

haru01

const result = [1,2,3,4,5,6]
  .filter(n => n % 2 === 0)
  .map(n => n * n)
  .reduce((a, b) => a + b, 0);
console.log(result); // (2*2) + (4*4) + (6*6)

haru01

// https://github.com/j5ik2o/ticket-price-modeling
// 解き方方針: 型で問題を解くよりも、料金表のように日本人の非エンジニアの人も読めて突っ込めるコード記述を目指す.
// 解き方方針： 配列でmap&sortの世界に引き込んで安い料金を選ぶようにする.
// 解いたのは "シネマシティズン" の場合だけ。

// TODO 引数を型にして呼び出しに制約を設けるかはあとで考える。
const movePayment =  (ticketType, timeTypes) => {
  var payments =
  {"シネマシティズン":
    {"平日〜20:00":        1000, 

haru01

interface Expression {
  times(muptiplier: number): Expression;
  plus(addend: Expression): Expression;
  reduce(bank: Bank, to: string): Money
}

class Money implements Expression {
  private _amount: number
  private _currency: string

haru01

function createReportData(readList, recommendList) {
  const reportData = {};
  reportData.userName = readList.name;
  reportData.readBooks = readList.books
    .map(book => {
      return {...book, point: point(book)};
    });
  reportData.total = total(reportData);
  return reportData;

haru01

const createReportData = require('./createReportData');

function generateReadReport(readList, recommendList) {
  const reportData = createReportData(readList, recommendList);
  return renderPlainText(reportData);
}

function renderPlainText(reportData) {
  let report = `name: ${reportData.userName}\n`;
  report += '-----\n';

haru01

function generateReadReport(readList, recommendList) {
  const reportData = createReportData(readList, recommendList);
  return renderPlainText(reportData);
}

function createReportData(readList, recommendList) {
  const reportData = {};
  reportData.userName = readList.name;
  reportData.readBooks = readList.books
    .map(book => {

haru01

@@ -1,6 +1,6 @@
 function generateReadReport(readList, recommendList) {
   const reportData = createReportData(readList, recommendList);
-  return renderPlainText(reportData, recommendList);
+  return renderPlainText(reportData);
 }

 function createReportData(readList, recommendList) {
@@ -42,7 +42,7 @@ function createReportData(readList, recommendList) {
   }

haru01

@@ -10,8 +10,14 @@ function createReportData(readList, recommendList) {
     .map(book => {
       return {...book, point: point(book)};
     });
+  reportData.total = total(reportData);
   return reportData;

+  function total(reportData) {
+    return reportData.readBooks
+      .reduce((total, book) => total + book.point, 0);

haru01

function renderPlainText(reportData, recommendList) {
  let report = `name: ${reportData.userName}\n`;
  report += '-----\n';
  for (let book of reportData.readBooks) {
    if (book.times >= 1) {
      report += `  - ${book.name}: ${book.point} point\n`;
    }
  }
  report += '-----\n';
  report += `total: ${total()} point`;