From d53d3096ac955c2835f900dd3a1cb5cb5571954e Mon Sep 17 00:00:00 2001
From: Escaity <sfz2306@gmail.com>
Date: Mon, 27 Jun 2022 21:47:10 +0900
Subject: [PATCH 1/2] =?UTF-8?q?=E3=83=A9=E3=83=B3=E3=82=AD=E3=83=B3?=
 =?UTF-8?q?=E3=82=B0=E3=81=AE=E5=AE=9F=E8=A3=85=E5=AE=8C=E4=BA=86?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app.js | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/app.js b/app.js
index ad9a93a..3131b36 100644
--- a/app.js
+++ b/app.js
@@ -1 +1,46 @@
 'use strict';
+const fs = require('fs');
+const readline = require('readline');
+const rs = fs.createReadStream('./popu-pref.csv');
+const rl = readline.createInterface({ input: rs });
+const prefDataMap = new Map();
+rl.on('line', (lineString) => {
+  const columns = lineString.split(',');
+  const year = parseInt(columns[0]);
+  const pref = columns[1];
+  const popu = parseInt(columns[3]);
+  if (year === 2010 || year === 2015) {
+    let value = null;
+    if (prefDataMap.has(pref)) {
+      value = prefDataMap.get(pref);
+    } else {
+      value = {
+        popu10: 0,
+        popu15: 0,
+        change: null,
+      };
+    }
+    if (year === 2010) {
+      value.popu10 = popu;
+    }
+    if (year === 2015) {
+      value.popu15 = popu;
+    }
+    prefDataMap.set(pref, value);
+  }
+});
+
+rl.on('close', () => {
+  for (const [key, value] of prefDataMap) {
+    value.change = value.popu15 / value.popu10;
+  }
+  //Array.from( )でMapを配列に変換
+  const rankingArr = Array.from(prefDataMap).sort((pair1, pair2) => {
+    //降順に並び変える
+    return pair2[1].change - pair1[1].change;
+  });
+  const rankingStrings = rankingArr.map(([key, value]) => {
+    return `${key}: ${value.popu10}=>${value.popu15}　変化率: ${value.change}`;
+  });
+  console.log(rankingStrings);
+});

From b845f3140d52b65a96026a311886a8b4992c2275 Mon Sep 17 00:00:00 2001
From: Escaity <sfz2306@gmail.com>
Date: Tue, 28 Jun 2022 19:09:04 +0900
Subject: [PATCH 2/2] =?UTF-8?q?=E5=A4=89=E5=8C=96=E7=8E=87=E3=83=A9?=
 =?UTF-8?q?=E3=83=B3=E3=82=AD=E3=83=B3=E3=82=B0=E3=82=92=E6=98=87=E9=A0=86?=
 =?UTF-8?q?=E3=81=AB=E5=A4=89=E6=9B=B4?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app.js | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/app.js b/app.js
index 3131b36..e71e4e8 100644
--- a/app.js
+++ b/app.js
@@ -37,10 +37,11 @@ rl.on('close', () => {
   //Array.from( )でMapを配列に変換
   const rankingArr = Array.from(prefDataMap).sort((pair1, pair2) => {
     //降順に並び変える
-    return pair2[1].change - pair1[1].change;
+    // return pair2[1].change - pair1[1].change;
+    return pair1[1].change - pair2[1].change;
   });
-  const rankingStrings = rankingArr.map(([key, value]) => {
-    return `${key}: ${value.popu10}=>${value.popu15}　変化率: ${value.change}`;
+  const rankingStrings = rankingArr.map(([key, value], i) => {
+    return `第${i + 1}位　${key}　変化率: ${value.change}`;
   });
   console.log(rankingStrings);
 });