From 4b2839092d58cedf5a3410b1f8829d44c04b81e6 Mon Sep 17 00:00:00 2001
From: Mitsuo Sato <mitti310@gmail.com>
Date: Thu, 11 Nov 2021 13:30:20 +0900
Subject: [PATCH] =?UTF-8?q?=E7=B7=B4=E7=BF=92=E5=95=8F=E9=A1=8C=E5=AE=9F?=
 =?UTF-8?q?=E8=A3=85?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app.js  | 21 +++++++++++++++++----
 app2.js | 16 ++++++++++++++++
 app3.js | 19 +++++++++++++++++++
 3 files changed, 52 insertions(+), 4 deletions(-)
 create mode 100644 app2.js
 create mode 100644 app3.js

diff --git a/app.js b/app.js
index e5b6b400..6a7cfb33 100644
--- a/app.js
+++ b/app.js
@@ -1,8 +1,21 @@
 'use strict';
 const fs = require('fs');
 const fileName = './test.txt';
-for (let count = 0; count < 30; count++) {
-    fs.appendFile(fileName, 'おはようございます\n', 'utf8', () => {});
-    fs.appendFile(fileName, 'こんにちは\n', 'utf8', () => {});
-    fs.appendFile(fileName, 'こんばんは\n', 'utf8', () => {});
+
+function appendFilePromise(fileName, str) {
+  return new Promise((resolve) => {
+    fs.appendFile(fileName, str, 'utf8', () => resolve());
+  });
 }
+async function main() {
+  for (let count = 0; count < 500; count++) {
+    await appendFilePromise(fileName, 'あ');
+    await appendFilePromise(fileName, 'い');
+    await appendFilePromise(fileName, 'う');
+    await appendFilePromise(fileName, 'え');
+    await appendFilePromise(fileName, 'お');
+    await appendFilePromise(fileName, '\n');
+  }
+}
+  
+main();
\ No newline at end of file
diff --git a/app2.js b/app2.js
new file mode 100644
index 00000000..c904de84
--- /dev/null
+++ b/app2.js
@@ -0,0 +1,16 @@
+'use strict';
+const fs = require('fs');
+const fileName = './test.txt';
+
+function appendFilePromise(fileName, str){
+    return new Promise((resolve) =>{
+        fs.appendFile(fileName, str, 'utf8', () => resolve());
+    });
+}
+async function main() {
+    for (let count = 0; count < 30; count++) {
+        await appendFilePromise(fileName, 'おはようございます\n');
+        await appendFilePromise(fileName, 'こんにちは\n');
+        await appendFilePromise(fileName, 'こんばんは\n');
+    }
+}
\ No newline at end of file
diff --git a/app3.js b/app3.js
new file mode 100644
index 00000000..0347c57e
--- /dev/null
+++ b/app3.js
@@ -0,0 +1,19 @@
+'use strict';
+const fs = require('fs');
+const fileName = './test.txt';
+
+function appendFilePromise(fileName, str) {
+    return new Promise((resolve) => {
+        fs.appendFile(fileName, str, 'utf8', () => resolve());
+    });
+}
+
+for (let count = 0; count < 30; count++) {
+  appendFilePromise(fileName, 'おはようございます\n')
+    .then(() => {
+        return appendFilePromise(fileName, 'こんにちは\n');
+    })
+    .then(() => {
+        return appendFilePromise(fileName, 'こんばんは\n');
+    });
+}
\ No newline at end of file