Chapter 2: standard and review edits

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

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

Chapter02/working-with-files/readWriteAsync.js

@@ -1,16 +1,16 @@
-const fs = require('fs');
+const fs = require('fs')
 const path = require('path')
 
-const filepath = path.join(process.cwd(), 'hello.txt');
+const filepath = path.join(process.cwd(), 'hello.txt')
 
 fs.readFile(filepath, 'utf8', function (err, contents) {
-    if (err) {
-        return console.log(err);
-    }
-    console.log("File Contents:", contents);
-    contents = contents.toUpperCase();
-    fs.writeFile(filepath, contents, function (err) {
-        if (err) throw err;
-        console.log("File updated.")
-    });
-});
+  if (err) {
+    return console.log(err)
+  }
+  console.log('File Contents:', contents)
+  const upperContents = contents.toUpperCase()
+  fs.writeFile(filepath, upperContents, function (err) {
+    if (err) throw err
+    console.log('File updated.')
+  })
+})

Chapter02/working-with-files/readWriteAsync2.js

@@ -1,20 +1,22 @@
-const fs = require('fs');
+const fs = require('fs')
 const path = require('path')
 
-const filepath = path.join(process.cwd(), 'hello.txt');
+const filepath = path.join(process.cwd(), 'hello.txt')
 
 fs.readFile(filepath, 'utf8', function (err, contents) {
-    if (err) {
-        return console.log(err);
-    }
-    console.log("File Contents:", contents);
-    contents = contents.toUpperCase();
-    updateFile(filepath, contents);
-});
+  if (err) {
+    return console.log(err)
+  }
+  console.log('File Contents:', contents)
+  const upperContents = contents.toUpperCase()
+  setTimeout(() => updateFile(filepath, upperContents), 10)
+})
 
 function updateFile(filepath, contents) {
-    fs.writeFile(filepath, contents, function (err) {
-        if (err) throw err;
-        console.log("File updated.");
-    });
-};
+  fs.writeFile(filepath, contents, function (err) {
+    if (err) throw err
+    console.log('File updated.')
+  })
+}
+
+setInterval(() => process.stdout.write('**** \n'), 1).unref()

Chapter02/working-with-files/readWritePromise.js

@@ -1,15 +1,15 @@
-const fs = require("fs").promises;
-const path = require('path');
+const fs = require('fs').promises
+const path = require('path')
 
-const filepath = path.join(process.cwd(), 'hello.txt');
+const filepath = path.join(process.cwd(), 'hello.txt')
 
-async function run() {
-    try {
-        const contents = await fs.readFile(filepath, 'utf8');
-        console.log("File Contents:", contents);
-    } catch (error) {
-        console.error(error);
-    }
-};
+async function run () {
+  try {
+    const contents = await fs.readFile(filepath, 'utf8')
+    console.log('File Contents:', contents)
+  } catch (error) {
+    console.error(error)
+  }
+}
 
-run();
+run()

Chapter02/working-with-files/readWriteSync.js

@@ -1,12 +1,11 @@
-const fs = require('fs');
-const path = require('path');
+const fs = require('fs')
+const path = require('path')
 
-const filepath = path.join(process.cwd(), 'hello.txt');
+const filepath = path.join(process.cwd(), 'hello.txt')
 
-let contents = fs.readFileSync(filepath, 'utf8');
-console.log("File Contents:", contents);
+const contents = fs.readFileSync(filepath, 'utf8')
+console.log('File Contents:', contents)
 
-contents = contents.toString().toUpperCase();
-
-fs.writeFileSync(filepath, contents);
-console.log("File updated.");
+const upperContents = contents.toUpperCase()
+fs.writeFileSync(filepath, upperContents)
+console.log('File updated.')