From b2fd18a6ae167fec852c0cf0961acd399a86bc93 Mon Sep 17 00:00:00 2001
From: Kiyomi Watanabe <watanabe.kiyomi@piala.co.jp>
Date: Mon, 19 Apr 2021 13:45:13 +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=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 | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/app.js b/app.js
index ad9a93a7..eea944e6 100644
--- a/app.js
+++ b/app.js
@@ -1 +1,48 @@
 '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 prefectureDateMap = 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 = prefectureDateMap.get(prefecture);
+        if(!value){
+            value = {
+                popu10: 0,
+                popu15: 0,
+                change: null
+            };
+        }
+        if(year === 2010){
+            value.popu10 = popu;
+        }
+        if(year === 2015){
+            value.popu15 = popu;
+        }
+        prefectureDateMap.set(prefecture, value);
+    }
+});
+rl.on('close', () => {
+    for(let [key, value] of prefectureDateMap){
+        value.change = value.popu15 / value.popu10;
+    }
+    const rankingArray = Array.from(prefectureDateMap).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);
+});
+
+

From cffde6a7b61f0bea5a0972b4eb72f30dc7c23be8 Mon Sep 17 00:00:00 2001
From: Kiyomi Watanabe <watanabe.kiyomi@piala.co.jp>
Date: Mon, 19 Apr 2021 13:51:09 +0900
Subject: [PATCH 2/2] =?UTF-8?q?=E9=80=86=E3=83=A9=E3=83=B3=E3=82=AD?=
 =?UTF-8?q?=E3=83=B3=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, 4 insertions(+), 2 deletions(-)

diff --git a/app.js b/app.js
index eea944e6..346d6c20 100644
--- a/app.js
+++ b/app.js
@@ -32,10 +32,12 @@ rl.on('close', () => {
         value.change = value.popu15 / value.popu10;
     }
     const rankingArray = Array.from(prefectureDateMap).sort((pair1, pair2) =>{
-        return pair2[1].change - pair1[1].change;
+        return pair1[1].change - pair2[1].change;
     });
-    const rankingStrings = rankingArray.map(([key, value]) => {
+    const rankingStrings = rankingArray.map(([key, value], i) => {
+        i = i + 1;
         return(
+            i + '位' +
             key + ': ' +
             value.popu10 + '=>' +
             value.popu15 + ' 変化率:' +