Chapter 2: arrow functions

Chapter02/working-with-files/callback-hell.js

@@ -1,5 +0,0 @@
-first(args, function () {
-  second(args, function () {
-    third(args, function () {});
-  });
-});

Chapter02/working-with-files/readWriteAsync.js

@@ -3,7 +3,7 @@ const path = require("path");
 
 const filepath = path.join(process.cwd(), "hello.txt");
 
-fs.readFile(filepath, "utf8", function (err, contents) {
+fs.readFile(filepath, "utf8", (err, contents) => {
   if (err) {
     return console.log(err);
   }

Chapter02/working-with-files/readWriteAsync2.js

@@ -3,14 +3,14 @@ const path = require("path");
 
 const filepath = path.join(process.cwd(), "hello.txt");
 
-fs.readFile(filepath, "utf8", function (err, contents) {
+fs.readFile(filepath, "utf8", (err, contents) => {
   if (err) {
     return console.log(err);
   }
   console.log("File Contents:", contents);
   const upperContents = contents.toUpperCase();
 
-  fs.writeFile(filepath, upperContents, function (err) {
+  fs.writeFile(filepath, upperContents, (err) => {
     if (err) throw err;
     console.log("File updated.");
   });

Chapter02/working-with-files/readWriteAsyncNamed.js

@@ -3,7 +3,7 @@ const path = require("path");
 
 const filepath = path.join(process.cwd(), "hello.txt");
 
-fs.readFile(filepath, "utf8", function (err, contents) {
+fs.readFile(filepath, "utf8", (err, contents) => {
   if (err) {
     return console.log(err);
   }

Chapter02/working-with-files/readWriteAsyncTimeout.js

@@ -3,7 +3,7 @@ const path = require("path");
 
 const filepath = path.join(process.cwd(), "hello.txt");
 
-fs.readFile(filepath, "utf8", function (err, contents) {
+fs.readFile(filepath, "utf8", (err, contents) => {
   if (err) {
     return console.log(err);
   }

Chapter07/mysql-app/tasks.js

@@ -1,5 +1,5 @@
-require("dotenv").config();
 const mysql = require("mysql");
+require("dotenv").config();
 
 const db = mysql.createConnection({
   user: process.env.DB_MYSQL_USER,
@@ -9,12 +9,11 @@ const db = mysql.createConnection({
 db.query("CREATE DATABASE tasks");
 db.query("USE tasks");
 
-db.query(
-  "CREATE TABLE tasks.tasks (" +
-    "id INT NOT NULL AUTO_INCREMENT, " +
-    "task TEXT NOT NULL, PRIMARY KEY ( id )" +
-    ")"
-);
+db.query(`
+CREATE TABLE tasks.tasks (
+id INT NOT NULL AUTO_INCREMENT, 
+task TEXT NOT NULL, PRIMARY KEY ( id ))
+`);
 
 const ignore = new Set(["ER_DB_CREATE_EXISTS", "ER_TABLE_EXISTS_ERROR"]);
 
@@ -25,16 +24,15 @@ db.on("error", (err) => {
 
 db.query(`
 INSERT INTO tasks.tasks (task)
-VALUES ("Walk the dog"); 
+VALUES ("Walk the dog."); 
 `);
 
 db.query(
   `
 SELECT * FROM tasks.tasks;
 `,
-  (err, results) => {
+  (err, results, fields) => {
     console.log(results);
+    db.end();
   }
 );
-
-db.end();