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lecture one
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‎README.md

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Welcome to the exciting world of Node.js! In this lecture series, we will delve into the powerful features of Node.js, its benefits, and how it simplifies server-side JavaScript development. If you already have a solid understanding of JavaScript, you'll find that Node.js is a natural extension that allows you to leverage your existing skills to build robust and scalable applications.

‎es6.js

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//arrow functions
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function Add(a, b) {
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return a + b;
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}
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const add = (a, b) => a + b;
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////////////////////////////////
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// Template literals
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// Concatenation
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const name = "Alice";
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const age = 30;
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const message1 = "Welcome, " + name + "! You are " + age + " years old.";
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// Template Literals
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const message2 = `Welcome, ${name}! You are ${age} years old.`;
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////////////////////////////////
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// array methods
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const numbers = [1, 2, 3, 4, 5];
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numbers.filter((n) => n % 2 === 0); // [2, 4]
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numbers.map((n) => n * 2); // [2, 4, 6, 8, 10]
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numbers.reduce((total, n) => total + n, 0); // 15
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numbers.forEach((n) => console.log(n)); // 1 2 3 4 5
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numbers.find((n) => n === 3); // 3
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numbers.findIndex((n) => n === 3); // 2
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numbers.every((n) => n < 10); // true
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numbers.some((n) => n > 10); // false
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numbers.sort((a, b) => b - a); // [5, 4, 3, 2, 1]
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numbers.reverse(); // [5, 4, 3, 2, 1]
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numbers.slice(0, 2); // [1, 2]
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numbers.splice(0, 2); // [1, 2]
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numbers.pop(); // [1, 2, 3, 4]
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numbers.push(6); // [1, 2, 3, 4, 6]
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numbers.includes(3); // true
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////////////////////////////////
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// object methods
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const person = {
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name: "Alice",
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age: 30,
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greet: function () {
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console.log(`Hello, my name is ${this.name}!`);
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},
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};
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person.greet(); // Hello, my name is Alice!
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////////////////////////////////
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// destructuring
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const { name, age } = person;
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console.log(name); // Alice
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console.log(age); // 30
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////////////////////////////////
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// array destructuring
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const [first, second, ...rest] = numbers;
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console.log(first); // 1
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console.log(second); // 2
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console.log(rest); // [3, 4, 5]
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////////////////////////////////
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// default parameters
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function greet(name = "World") {
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console.log(`Hello, ${name}!`);
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}
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greet(); // Hello, World!

‎filesystem.js

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const fs = require("fs");
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const content = fs.readFileSync("./MyDirectory/hello.html");
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fs.writeFileSync("hello.html", "Hello from Node.js");
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fs.mkdirSync("MyDirectory");

‎package.json

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{
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"name": "nodejs-course",
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"version": "1.0.0",
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"description": "",
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"main": "index.js",
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"scripts": {
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"test": "echo \"Error: no test specified\" && exit 1"
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},
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"keywords": [],
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"author": "",
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"license": "ISC"
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}

‎pages/about.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>about ruppin</title>
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</head>
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<body>
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<h1>About us</h1>
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</body>
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</html>

‎pages/contact.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Hello ruppin</title>
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</head>
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<body>
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<h1>Contact us</h1>
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</body>
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</html>

‎pages/hello.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Hello ruppin</title>
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</head>
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<body>
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<h1>hello ruppin server</h1>
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</body>
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</html>

‎routing.js

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// node js server with routing
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const http = require("http");
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const fs = require("fs");
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const pages = "pages";
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http
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.createServer((req, res) => {
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if (req.method === "GET") {
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if (req.url === "/") {
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const content = fs.readFileSync(`./${pages}/hello.html`);
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res.writeHead(200, { "Content-Type": "text/html" });
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return res.end(content);
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}
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if (req.url === "/about") {
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const content = fs.readFileSync(`./${pages}/about.html`);
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res.writeHead(200, { "Content-Type": "text/html" });
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return res.end(content);
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}
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if (req.url === "/contact") {
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const content = fs.readFileSync(`./${pages}/contact.html`);
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res.writeHead(200, { "Content-Type": "text/html" });
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return res.end(content);
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}
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}
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if (req.method === "POST") {
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fs.writeFileSync("hello.html", "Hello from Node.js");
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res.writeHead(200, { "Content-Type": "text/html" });
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return res.end("File saved");
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}
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})
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.listen(9999, () => {
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console.log("Server running at port 9999");
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});

‎server.js

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const http = require("http");
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http
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.createServer((req, res) => {
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res.writeHead(200, { "Content-Type": "text/html" });
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res.end("Hello Ruppin!");
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})
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.listen(9999, () => {
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console.log("Server running at port 9999");
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});

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