HassanAlgoz

sudo apt-get install linux-headers-$(uname -r) build-essential dkms

VERSION=6.1.34
wget http://download.virtualbox.org/virtualbox/$VERSION/VBoxGuestAdditions_$VERSION.iso
sudo mkdir /media/VBoxGuestAdditions
sudo mount -o loop,ro VBoxGuestAdditions_$VERSION.iso /media/VBoxGuestAdditions
sudo sh /media/VBoxGuestAdditions/VBoxLinuxAdditions.run
rm VBoxGuestAdditions_$VERSION.iso
sudo umount /media/VBoxGuestAdditions
sudo rmdir /media/VBoxGuestAdditions

HassanAlgoz

// Arrow Functions
function isEven(number) {
    return (number % 2 === 0);
}
let isEven = function (number) {
    return (number % 2 === 0);
}
// drop the 'function' keyword, and append '=>' after function parameters
let isEven = (number) => {
    return (number % 2 === 0);

HassanAlgoz

const http = require('http')
// The `url` module splits up a web address into readable parts
const url = require('url')

http.createServer((req, res) => {
    res.writeHead(200, {'Content-Type': 'text/html'})
	
    // url.parse() will return a URL object with each part of the address as properties
	
    let urlObject = url.parse(req.url, true)

HassanAlgoz

Node.js HTTP Server

YouTube Lesson by Hassan Algoz.

let http = require('http')

let server = http.createServer(function(req, res) {

    // req: methods and properties for request
    // res: method and properties for response

HassanAlgoz

• Tutorial by: Hassan Algoz
• YouTube Channel: https://www.youtube.com/channel/UCaD5hX1OzVezzbIqHm3VHsQ
• Vocabulary: API, fetch, XMLHttpRequest, promises, GET, HTTP, asynchronous.
  • json (JSON): JavaScript Object Notation

fetch is the modern equivalent to XMLHttpRequest. fetch uses promises.

A function that uses promises can chain .thens to allow for asynchronous flow that listens for when the task is completed, rather than wait.

HassanAlgoz

// Callback Functions: passing functions to functions

function processArray(array, func) {
	let resultArray = []
	for(let i = 0; i < array.length; i++) {
		resultArray[i] = func(array[i])
	}
	return resultArray
}

HassanAlgoz

console.log('script-DOM.js') // DOM: Document Object Model

// Selection by Id
let title = document.getElementById("main-title")
title.innerHTML += " Hello World"; // Modifying Text

// Also Selection by Id, using CSS selectors
let subtitle = document.querySelector('#subtitle')

// The querySelector(string) is powerful in that you can

HassanAlgoz

window.addEventListener('load', function() {

    // Recursion and loops (repetition)

    function greetings(str) {
        console.log(str)
        console.log(str)
        console.log(str)
    }

HassanAlgoz

window.addEventListener('load', function() {

	console.log("Hello from script.js")
	
	// Functions
	let a = Math.max(10, 43)
	
	console.log( myMax(99, 45) )
	console.log( myMin(34, 12) )
	

HassanAlgoz

developer tools > console
4 + 5
9 * 2
12 / 4
2 ** 3
true && false
true || false

age = 19
name = "Hasssan"