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Chapter 2: standard and review edits

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Beth Griggs 2020-05-18 21:34:02 +01:00
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15 changed files with 115 additions and 119 deletions
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14
Chapter02/communicating-with-sockets/client.js
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@ -1,12 +1,12 @@
const net = require('net'); const net = require('net')
const HOSTNAME = 'localhost'; const HOSTNAME = 'localhost'
const PORT = 3000; const PORT = 3000
const socket = net.connect(PORT, HOSTNAME); const socket = net.connect(PORT, HOSTNAME)
socket.write('World'); socket.write('World')
socket.on('data', (data) => { socket.on('data', (data) => {
console.log(data.toString()); console.log(data.toString())
}); })

17
Chapter02/communicating-with-sockets/server.js
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@ -1,13 +1,12 @@
const net = require('net'); const net = require('net')
const HOSTNAME = 'localhost'; const HOSTNAME = 'localhost'
const PORT = 3000; const PORT = 3000
net.createServer((socket) => { net.createServer((socket) => {
console.log('Client connected.'); console.log('Client connected.')
socket.on('data', name => { socket.on('data', name => {
socket.write(`Hello ${name}!`); socket.write(`Hello ${name}!`)
}); })
}).listen(PORT, HOSTNAME)
}).listen(PORT, HOSTNAME);

8
Chapter02/fetching-metadata/chmod-octal.js
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@ -1,6 +1,4 @@
'use strict' const fs = require('fs')
const file = './file.txt'
const fs = require('fs'); fs.chmodSync(file, 0o664)
const file = './file.txt';
fs.chmodSync("./file.txt", 0o664);

14
Chapter02/fetching-metadata/chmod.js
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@ -1,9 +1,7 @@
'use strict' const fs = require('fs')
const file = './file.txt'
const fs = require('fs'); fs.chmodSync(file,
const file = './file.txt'; fs.constants.S_IRUSR | fs.constants.S_IWUSR |
fs.constants.S_IRGRP | fs.constants.S_IWGRP |
fs.chmodSync("./file.txt", fs.constants.S_IROTH)
fs.constants.S_IRUSR | fs.constants.S_IWUSR |
fs.constants.S_IRGRP | fs.constants.S_IWGRP |
fs.constants.S_IROTH);

14
Chapter02/fetching-metadata/metadata.js
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@ -1,9 +1,9 @@
const fs = require('fs'); const fs = require('fs')
const file = process.argv[2]; const file = process.argv[2]
function printMetadata(file) { function printMetadata (file) {
const fileStats = fs.statSync(file); const fileStats = fs.statSync(file)
console.log(fileStats); console.log(fileStats)
}; }
printMetadata(file); printMetadata(file)

22
Chapter02/fetching-metadata/metadata2.js
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@ -1,13 +1,13 @@
const fs = require('fs'); const fs = require('fs')
const file = process.argv[2]; const file = process.argv[2]
function printMetadata(file) { function printMetadata (file) {
try { try {
const fileStats = fs.statSync(file); const fileStats = fs.statSync(file)
console.log(fileStats); console.log(fileStats)
} catch (err) { } catch (err) {
console.error("Error reading file path:", file); console.error('Error reading file path:', file)
} }
}; }
printMetadata(file); printMetadata(file)

8
Chapter02/file-watching/watch.js
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@ -1,6 +1,6 @@
const fs = require('fs'); const fs = require('fs')
const file = './file.txt'; const file = './file.txt'
fs.watchFile(file, (current, previous) => { fs.watchFile(file, (current, previous) => {
return console.log(`${file} updated ${time}`) return console.log(`${file} updated ${time}`)
}); })

12
Chapter02/file-watching/watch2.js
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@ -1,8 +1,8 @@
const fs = require('fs'); const fs = require('fs')
const file = './file.txt'; const file = './file.txt'
const moment = require('moment'); const moment = require('moment')
fs.watch(file, (eventType, filename) => { fs.watch(file, (eventType, filename) => {
const time = moment().format('MMMM Do YYYY, h:mm:ss a'); const time = moment().format('MMMM Do YYYY, h:mm:ss a')
return console.log(`${filename} updated ${time}`) return console.log(`${filename} updated ${time}`)
}); })

8
Chapter02/interfacing-with-io/greeting.js
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@ -1,4 +1,4 @@
process.stdin.on('data', (data) => { process.stdin.on('data', data => {
let name = data.toString().trim().toUpperCase(); const name = data.toString().trim().toUpperCase()
process.stdout.write(`Hello ${name}!`); process.stdout.write(`Hello ${name}!`)
}); })

14
Chapter02/interfacing-with-io/greeting2.js
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@ -1,8 +1,8 @@
process.stdin.on('data', data => { process.stdin.on('data', data => {
let name = data.toString().trim().toUpperCase(); const name = data.toString().trim().toUpperCase()
if (name != '') { if (name !== '') {
process.stdout.write(`Hello ${name}!`); process.stdout.write(`Hello ${name}!`)
} else { } else {
process.stderr.write('Input was empty.'); process.stderr.write('Input was empty.')
} }
}); })

8
Chapter02/working-with-files/callback-hell.js
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@ -1,5 +1,5 @@
first(args, function () { first(args, function () {
second(args, function () { second(args, function () {
third(args, function () {}) third(args, function () {})
}) })
}) })

24
Chapter02/working-with-files/readWriteAsync.js
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@ -1,16 +1,16 @@
const fs = require('fs'); const fs = require('fs')
const path = require('path') 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) { fs.readFile(filepath, 'utf8', function (err, contents) {
if (err) { if (err) {
return console.log(err); return console.log(err)
} }
console.log("File Contents:", contents); console.log('File Contents:', contents)
contents = contents.toUpperCase(); const upperContents = contents.toUpperCase()
fs.writeFile(filepath, contents, function (err) { fs.writeFile(filepath, upperContents, function (err) {
if (err) throw err; if (err) throw err
console.log("File updated.") console.log('File updated.')
}); })
}); })

30
Chapter02/working-with-files/readWriteAsync2.js
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@ -1,20 +1,22 @@
const fs = require('fs'); const fs = require('fs')
const path = require('path') 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) { fs.readFile(filepath, 'utf8', function (err, contents) {
if (err) { if (err) {
return console.log(err); return console.log(err)
} }
console.log("File Contents:", contents); console.log('File Contents:', contents)
contents = contents.toUpperCase(); const upperContents = contents.toUpperCase()
updateFile(filepath, contents); setTimeout(() => updateFile(filepath, upperContents), 10)
}); })
function updateFile(filepath, contents) { function updateFile(filepath, contents) {
fs.writeFile(filepath, contents, function (err) { fs.writeFile(filepath, contents, function (err) {
if (err) throw err; if (err) throw err
console.log("File updated."); console.log('File updated.')
}); })
}; }
setInterval(() => process.stdout.write('**** \n'), 1).unref()

24
Chapter02/working-with-files/readWritePromise.js
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@ -1,15 +1,15 @@
const fs = require("fs").promises; const fs = require('fs').promises
const path = require('path'); const path = require('path')
const filepath = path.join(process.cwd(), 'hello.txt'); const filepath = path.join(process.cwd(), 'hello.txt')
async function run() { async function run () {
try { try {
const contents = await fs.readFile(filepath, 'utf8'); const contents = await fs.readFile(filepath, 'utf8')
console.log("File Contents:", contents); console.log('File Contents:', contents)
} catch (error) { } catch (error) {
console.error(error); console.error(error)
} }
}; }
run(); run()

17
Chapter02/working-with-files/readWriteSync.js
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@ -1,12 +1,11 @@
const fs = require('fs'); const fs = require('fs')
const path = require('path'); 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'); const contents = fs.readFileSync(filepath, 'utf8')
console.log("File Contents:", contents); console.log('File Contents:', contents)
contents = contents.toString().toUpperCase(); const upperContents = contents.toUpperCase()
fs.writeFileSync(filepath, upperContents)
fs.writeFileSync(filepath, contents); console.log('File updated.')
console.log("File updated.");