From af72e8ff66cc052029d75f8ca94667f88b245348 Mon Sep 17 00:00:00 2001
From: yasu-ryo <ryoother@icloud.com>
Date: Mon, 24 Jan 2022 14:23:08 +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 | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/app.js b/app.js
index ad9a93a7..a2c32c10 100644
--- a/app.js
+++ b/app.js
@@ -1 +1,44 @@
 'use strict';
+const fs = require('fs');
+const readline = require('readline');
+const rs = fs.createReadStream('./popu-pref.csv');
+const rl = readline.createInterface({ input: rs, output: {} });
+const prefectureDataMap = new Map(); // key: 都道府県 value: 集計データのオブジェクト
+rl.on('line', lineString => {
+  const columns = lineString.split(',');
+  const year = parseInt(columns[0]);
+  const prefecture = columns[1];
+  const popu = parseInt(columns[3]);
+  if (year === 2010 || year === 2015) {
+    let value = prefectureDataMap.get(prefecture);
+    if (!value) { //　都道府県のデータがなかった場合
+      // データの初期化
+      value = {
+        popu10: 0,
+        popu15: 0,
+        change: null
+      };
+    }
+    if (year === 2010) {
+      value.popu10 = popu;
+    }
+    if (year === 2015) {
+      value.popu15 = popu;
+    }
+    prefectureDataMap.set(prefecture, value);
+  }
+});
+rl.on('close', () => {
+    for (let [key, value] of prefectureDataMap) {
+        value.change = value.popu15 / value.popu10;
+    }
+    const rankingArray = Array.from(prefectureDataMap).sort((pair1, pair2) => {
+        return pair2[1].change - pair1[1].change;
+    });
+    const rankingStrings = rankingArray.map(([key, value]) => {
+        return (
+            key + ': ' + value.popu10 + '=>' + value.popu15 + ' 変化率:' + value.change
+        );
+    })
+      console.log(rankingStrings);
+});
\ No newline at end of file

From 74f70fd02a7bb001868baad147d83338baeda8af Mon Sep 17 00:00:00 2001
From: yasu-ryo <ryoother@icloud.com>
Date: Mon, 24 Jan 2022 14:28:43 +0900
Subject: [PATCH 2/2] =?UTF-8?q?=E4=BA=BA=E3=81=8C=E6=B8=9B=E3=81=A3?=
 =?UTF-8?q?=E3=81=9F=E5=89=B2=E5=90=88=E3=81=AE=E3=83=A9=E3=83=B3=E3=82=AD?=
 =?UTF-8?q?=E3=83=B3=E3=82=B0=E3=81=AB=E6=94=B9=E5=A4=89=E3=82=92=E5=AE=9F?=
 =?UTF-8?q?=E8=A1=8C?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app.js | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/app.js b/app.js
index a2c32c10..c67eba13 100644
--- a/app.js
+++ b/app.js
@@ -33,12 +33,10 @@ rl.on('close', () => {
         value.change = value.popu15 / value.popu10;
     }
     const rankingArray = Array.from(prefectureDataMap).sort((pair1, pair2) => {
-        return pair2[1].change - pair1[1].change;
+        return pair1[1].change - pair2[1].change;
     });
-    const rankingStrings = rankingArray.map(([key, value]) => {
-        return (
-            key + ': ' + value.popu10 + '=>' + value.popu15 + ' 変化率:' + value.change
-        );
+    const rankingStrings = rankingArray.map(([key, value], i) => {
+        return (i + 1) + "位" + key + ': ' + value.popu10 + '=>' + value.popu15 + ' 変化率:' + value.change;
     })
       console.log(rankingStrings);
 });
\ No newline at end of file