From d7c04ab1d52eb2911c1da452030ac19747f32e84 Mon Sep 17 00:00:00 2001
From: murakawamasayuki <82010327+murakawamasayuki@users.noreply.github.com>
Date: Mon, 19 Apr 2021 16:14:25 +0900
Subject: [PATCH 1/2] Update app.js

---
 app.js | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/app.js b/app.js
index ad9a93a7..00b31858 100644
--- a/app.js
+++ b/app.js
@@ -1 +1,52 @@
 '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();
+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){
+            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 pair1[1].change - pair2[1].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);
+});

From e62b95958623dba736838039e10bb582f52ccf12 Mon Sep 17 00:00:00 2001
From: murakawamasayuki <82010327+murakawamasayuki@users.noreply.github.com>
Date: Mon, 19 Apr 2021 16:15:34 +0900
Subject: [PATCH 2/2] =?UTF-8?q?2010=20=E5=B9=B4=E3=81=8B=E3=82=89=202015?=
 =?UTF-8?q?=20=E5=B9=B4=E3=81=AB=E3=81=8B=E3=81=91=E3=81=A6=2015=E3=80=9C1?=
 =?UTF-8?q?9=20=E6=AD=B3=E3=81=AE=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=E9=83=BD=E9=81=93=E5=BA=9C?=
 =?UTF-8?q?=E7=9C=8C=E3=83=A9=E3=83=B3=E3=82=AD=E3=83=B3=E3=82=B0=E3=82=B3?=
 =?UTF-8?q?=E3=83=BC=E3=83=89?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app.js b/app.js
index 00b31858..f21f9238 100644
--- a/app.js
+++ b/app.js
@@ -46,7 +46,7 @@ rl.on('close',() =>{
           ' 変化率:' +
           value.change
     );
-        
+       
       });
     console.log(rankingStrings);
 });