From 5386d15de4bd5dca978fa344b04925c9477c0a2f Mon Sep 17 00:00:00 2001
From: kkomeng <komix68@gmail.com>
Date: Tue, 3 Oct 2023 13:31:13 +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=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 | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/app.js b/app.js
index ad9a93a7..ff4690e0 100644
--- a/app.js
+++ b/app.js
@@ -1 +1,43 @@
 'use strict';
+const fs = require('fs');
+const readline = require('readline');
+const rs = fs.ReadStream('./popu-pref.csv');
+const rl = readline.createInterface({ 'input': rs, 'output': {}});
+const map = new Map();
+rl.on('line', (lineString) => {
+  const columns = lineString.split(',');
+  const year = parseInt(columns[0]);
+  const prefecture = columns[2];
+  const popu = parseInt(columns[7]);
+  if (year === 2010 || year === 2015) {
+    let value = map.get(prefecture);
+    if (!value) {
+      value = {
+        popu10: 0,
+        popu15: 0,
+        change: null
+      };
+    }
+    if (year === 2010) {
+      value.popu10 += popu;
+    }
+    if (year === 2015) {
+      value.popu15 += popu;
+    }
+    map.set(prefecture, value);
+  }
+});
+rl.resume();
+rl.on('close', () => {
+  for (let pair of map) {
+    const value = pair[1];
+    value.change = value.popu15 / value.popu10;
+  }
+  const rankingArray = Array.from(map).sort((pair1, pair2) => {
+    return pair2[1].change - pair1[1].change;
+  });
+  const rankingStrings = rankingArray.map((pair) => {
+    return pair[0] + ': ' + pair[1].popu10 + '=>' + pair[1].popu15 + ' 変化率:' + pair[1].change;
+  });
+  console.log(rankingStrings);
+});
\ No newline at end of file

From d03f1524cddc4e5bea1fb69873b21bd90dabe6a2 Mon Sep 17 00:00:00 2001
From: kkomeng <komix68@gmail.com>
Date: Tue, 3 Oct 2023 13:43:52 +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=82=92=E9=99=8D=E9=A0=86=E3=81=AB=E4=BF=AE=E6=AD=A3?=
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(-)
 mode change 100644 => 100755 app.js

diff --git a/app.js b/app.js
old mode 100644
new mode 100755
index ff4690e0..b656c400
--- a/app.js
+++ b/app.js
@@ -34,10 +34,10 @@ rl.on('close', () => {
     value.change = value.popu15 / value.popu10;
   }
   const rankingArray = Array.from(map).sort((pair1, pair2) => {
-    return pair2[1].change - pair1[1].change;
+    return pair1[1].change - pair2[1].change;
   });
-  const rankingStrings = rankingArray.map((pair) => {
-    return pair[0] + ': ' + pair[1].popu10 + '=>' + pair[1].popu15 + ' 変化率:' + pair[1].change;
+  const rankingStrings = rankingArray.map((pair, i) => {
+    return (i + 1)+ '位' + pair[0] + ': ' + pair[1].popu10 + '=>' + pair[1].popu15 + ' 変化率:' + pair[1].change;
   });
   console.log(rankingStrings);
 });
\ No newline at end of file