From e992e30e9c8a174a5e92ef94de595c1cea5af91d Mon Sep 17 00:00:00 2001
From: mashmaru3 <miyaomash380@gmail.com>
Date: Sat, 10 Sep 2022 01:19:49 +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..a805b0b 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, 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 = null;
+        if (prefectureDataMap.has(prefecture)) {
+          value = prefectureDataMap.get(prefecture);
+        } else {
+          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 (const [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 rankingString = rankingArray.map(([key, value])=>{
+        return (
+            `${key}: ${value.popu10}=>${value.popu15}変化率: ${value.change}`
+        );
+      });
+      console.log(rankingString);
+    });

From badee90e353fac32c1103550fb31c313dd000840 Mon Sep 17 00:00:00 2001
From: mashmaru3 <miyaomash380@gmail.com>
Date: Sat, 10 Sep 2022 12:49:03 +0900
Subject: [PATCH 2/2] =?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 | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/app.js b/app.js
index a805b0b..fd1ef23 100644
--- a/app.js
+++ b/app.js
@@ -35,11 +35,11 @@ rl.on('line', lineString =>{
         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 rankingString = rankingArray.map(([key, value])=>{
+      const rankingString = rankingArray.map(([key, value],i)=>{
         return (
-            `${key}: ${value.popu10}=>${value.popu15}変化率: ${value.change}`
+            `${i + 1}位 ${key}: ${value.popu10}=>${value.popu15} 変化率: ${value.change}`
         );
       });
       console.log(rankingString);