public/web-development/presentation.git

			@@ -27,19 +27,17 @@
			<h3>Grundlagen</h3>
			<ul>
			<li>HTML/CSS/JS</li>
			<li>JSON</li>
			<li>HTTP-Protokoll</li>
			<li>Debugger</li>
			<li>JSON</li>
			</ul>
			</section>
			<section>
			<h3>Fortgeschrittenes</h3>
			<ul>
			<li>NodeJS</li>
			<li>JavaScript</li>
			<li>Responsive Design</li>
			<li>CSS-Animationen</li>
			<li>NodeJS</li>
			<li>WebComponents / lit</li>
			<li>Canvas-Element</li>
			<li>Datenbank</li>
			</ul>
			</section>
			@@ -58,6 +56,8 @@
			<section>
			<h3>Interessante Technologien</h3>
			<ul>
			<li>Canvas-Element</li>
			<li>CSS-Animationen</li>
			<li>WebSockets</li>
			<li>WebWorker</li>
			<li>ServiceWorker</li>
			@@ -498,29 +498,18 @@
			</table>
			</section>
			<section>
			<pre>
			<code class="html" data-trim data-line-numbers>
			<script type="text/template">
			<!DOCTYPE html>
			<html lang="de">
			<head>
			<meta charset="UTF-8">
			</head>
			<body>
			<!-- code -->
			</body>
			</html>
			</script>
			</code>
			</pre>
			</section>
			<section>
			<p>Code wird zwischen <code>script</code>-Tags geschrieben</p>
			<pre>
			<code class="html" data-trim data-line-numbers>
			<script>
			...
			</script>
			<!DOCTYPE html>
			<html lang="de">
			<head>
			<meta charset="UTF-8">
			</head>
			<body>
			<script>// code</script>
			</body>
			</html>
			</code>
			</pre>
			</section>
			@@ -549,6 +538,2533 @@
			</pre>
			</section>
			</section>
			<section>
			<section>
			<h2>Auslagern in verschiedene Dateien</h2>
			</section>
			<section>
			<pre>
			<code class="html" data-trim data-line-numbers>
			<!DOCTYPE html>
			<html>
			<head>
			<!-- CSS -->
			<link href="styles.css" rel="stylesheet">
			</head>
			<body>
			<!-- JS -->
			<script src="index.js"></script>
			</body>
			</html>
			</code>
			</pre>
			</section>
			<section>
			<p>Parsen eines HTML-Dokuments</p>
			<pre>
			<code class="html" data-trim data-line-numbers="1\|2\|3\|4\|5\|6\|7\|8\|9\|10">
			<script type="text/template">
			<!DOCTYPE html>
			<html lang="de">
			<head>
			<meta charset="UTF-8">
			<title>Coole Seite 😀</title>
			</head>
			<body>
			<div>Ganz langer Text</div>
			</body>
			</html>
			</script>
			</code>
			</pre>
			</section>
			<section>
			<p>Verschiedene Varianten, JavaScript erst am Ende auszuführen</p>
			<p>Damals mit jQuery:</p>
			<pre>
			<code class="html" data-trim data-line-numbers>
			<!DOCTYPE html>
			<html>
			<head>
			<script>
			$(document).ready((event) => {
			const element = document.querySelector("#hello");
			});
			</script>
			</head>
			<body>
			<div id="hello">Hello World!</div>
			</body>
			</html>
			</code>
			</pre>
			</section>
			<section>
			<p><code>script</code>-Tag am Ende</p>
			<pre>
			<code class="html" data-trim data-line-numbers>
			<!DOCTYPE html>
			<html>
			<head>
			</head>
			<body>
			<div>Hello World!</div>
			...
			<script src="index.js"></script>
			</body>
			</html>
			</code>
			</pre>
			</section>
			<section>
			<p>Event-basiert, z.B. per DOMContentLoaded</p>
			<pre>
			<code class="html" data-trim data-line-numbers>
			<!DOCTYPE html>
			<html>
			<head>
			<script>
			document.addEventListener("DOMContentLoaded", (event) => {
			// wird ausgeführt, sobald das Dokument geparst wurde
			const element = document.querySelector("#hello");
			});
			</script>
			</head>
			<body>
			<div id="hello">Hello World!</div>
			</body>
			</html>
			</code>
			</pre>
			</section>
			<section>
			<p>Moderne Variante</p>
			<pre>
			<code class="html" data-trim data-line-numbers>
			<script src="index.js" defer></script>
			</code>
			</pre>
			</section>
			<section>
			<h2><code>document</code>-Operationen</h2>
			<pre>
			<code class="js" data-trim data-line-numbers>
			document.open();
			document.write("<div>Booo!</div>");
			document.close();
			</code>
			</pre>
			</section>
			<section>
			<a href="https://developer.mozilla.org/en-US/docs/Web/API/Document/write">
			<img data-src="/assets/images/document.write.jpg">
			</a>
			</section>
			<section>
			<pre>
			<code class="html" data-trim data-line-numbers>
			<body>
			<script>document.write("<p>Dies ist ein Text.</p>")</script>
			<button>Dunkle Magie</button>
			<script>
			const button = document.querySelector("button");

			button.addEventListener("click", () => {
			document.write("Und pfutsch!");
			});
			</script>
			</body>
			</code>
			</pre>
			</section>
			</section>
			<section>
			<section>
			<h2>HTTP-Protokoll</h2>
			</section>
			<section>
			<img data-src="/assets/images/osi-model.jpg">
			</section>
			<section>
			<ul>
			<li>OSI-Schichten 5, 6 und 7</li>
			<li>Anfrage-Antwort-Prinzip</li>
			<li>Basiert auf einfachem Text</li>
			</ul>
			</section>
			<section>
			<table>
			<tr><th>Version</th><th>Jahr</th></tr>
			<tr><th>0.9</th><th>1991</th></tr>
			<tr><th>1.0</th><th>1996</th></tr>
			<tr><th>1.1</th><th>1999</th></tr>
			<tr><th>2.0</th><th>2015</th></tr>
			<tr><th>3.0</th><th>2022</th></tr>
			</table>
			</section>
			<section>
			<p>Request an www.google.de</p>
			<pre>
			<code class="http" data-trim data-line-numbers>
			GET / HTTP/1.1
			Host: www.google.de
			User-Agent: curl/7.88.1
			Accept: /
			</code>
			</pre>
			</section>
			<section>
			<p>Response von www.google.de</p>
			<pre>
			<code class="http" data-trim data-line-numbers>
			HTTP/1.1 200 OK
			Date: Tue, 04 Apr 2023 15:45:26 GMT
			Expires: -1
			Cache-Control: private, max-age=0
			Content-Type: text/html; charset=ISO-8859-1
			Content-Security-Policy-Report-Only: [...]
			Server: gws
			X-XSS-Protection: 0
			X-Frame-Options: SAMEORIGIN
			Set-Cookie: [...]
			Accept-Ranges: none
			Vary: Accept-Encoding
			Transfer-Encoding: chunked

			<!doctype html><html>...</html>
			</code>
			</pre>
			</section>
			<section>
			<p>Einfach mal testen:</p>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			curl -v --http1.0 http://www.google.de
			curl -v --http1.1 http://www.google.de
			curl -v --http2 http://www.google.de
			curl -v --http2-prior-knowledge http://www.google.de
			curl -v --http3 http://www.google.de
			</code>
			</pre>
			</section>
			<section>
			<p>Verschiedene "Verben" bzw. "Methoden"</p>
			<ul>
			<li>GET</li>
			<li>POST</li>
			<li>PUT</li>
			<li>PATCH</li>
			<li>DELETE</li>
			<li>...</li>
			</ul>
			</section>
			<section>
			<p>Beispiel:</p>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			git clone https://git.furnco.de/r/public/web-development/examples.git
			cd examples/templates/005-http-rest
			node index.js
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="text" data-trim data-line-numbers>
			curl -X GET -is http://localhost:3000/todo
			curl -X POST -H "Content-Type: application/json" -d '{"name": "Einkaufen"}' -is http://localhost:3000/todo
			curl -X POST -H "Content-Type: application/json" -d '{"name": "Putzen"}' -is http://localhost:3000/todo
			curl -X PUT -H "Content-Type: application/json" -d '{"name": "Schlafen"}' -is http://localhost:3000/todo/1
			curl -X DELETE -is http://localhost:3000/todo/0
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="text" data-trim data-line-numbers>
			HTTP/1.1 200 OK
			X-Powered-By: Express
			Content-Type: application/json; charset=utf-8
			Content-Length: 13
			ETag: W/"d-KMmUcQ1kigqtwzZnU+jVDkYP3Co"
			Date: Wed, 05 Apr 2023 12:05:05 GMT
			Connection: keep-alive
			Keep-Alive: timeout=5

			["Einkaufen"]
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers="">
			app.get("/todo", (req, res) => {
			return res.json(todos);
			});

			// [...]

			app.post("/todo", (req, res) => {
			// [...]
			return res.json(todos);
			// [...]
			});
			</code>
			</pre>
			</section>
			<section>
			<p><code>GET</code> und <code>POST</code> auf klassischen Webseiten</p>
			<pre>
			<code class="html" data-trim data-line-numbers>
			<form method="post" action="/todo">
			<input name="todo"><button>add</button>
			</form>
			</code>
			</pre>
			<p>Beispiel:</p>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			cd examples/templates/006-http-web
			node index.js
			</code>
			</pre>
			</section>
			</section>
			<section>
			<section>
			<h3>JSON</h3>
			</section>
			<section>
			<ul>
			<li><em class="h">J</em>ava<em class="h">S</em>cript <em class="h">O</em>bject <em class="h">N</em>otation</li>
			<li>Basiert auf reinem Text</li>
			<li>Format zur strukturierten Speicherung von Daten</li>
			<li>Attribute müssen immer in doppelte Anführungsstriche (<code>"</code>) gesetzt werden</li>
			</ul>
			</section>
			<section>
			<p>Definition eines einfachen Objekts in JS</p>
			<pre>
			<code class="js" data-trim data-line-numbers>
			const o = {
			x: 1,
			y: 2
			};
			</code>
			</pre>
			</section>
			<section>
			<p>Entsprechung in JSON</p>
			<pre>
			<code class="js" data-trim data-line-numbers>
			{
			"x": 1,
			"y": 2
			}
			</code>
			</pre>
			</section>
			<section>
			<p>Mögliche Typen</p>
			<p>
			<ul>
			<li>Number (bzw. Integer / Float)</li>
			<li>Boolean</li>
			<li>String</li>
			<li>Array</li>
			<li>Object</li>
			</ul>
			</p>
			</section>
			<section>
			<p>Der äußere Container kann ein Array oder ein Object sein</p>
			<pre>
			<code class="js" data-trim data-line-numbers>
			{
			"key": "value",
			}
			</code>
			</pre>
			<pre>
			<code class="js" data-trim data-line-numbers>
			[
			"foo",
			"bar"
			]
			</code>
			</pre>
			</section>
			</section>
			<section>
			<section>
			<h2>JavaScript</h2>
			</section>
			<section>
			<style>
			table.my-table td:not(:first-child) {
			text-align: center;
			}

			table.my-table td:not(:last-child), table.my-table th:not(:last-child) {
			border-right: 1px solid white;
			}

			table.my-table td {
			vertical-align: middle;
			}
			</style>
			<table class="my-table">
			<tr>
			<th></th>
			<th>c / c++</th>
			<th>Java</th>
			<th>C#</th>
			<th>JS</th>
			</tr>
			<tr>
			<td>Formale Spezifikation</td>
			<td colspan="4" class="fragment">ja</td>
			</tr>
			<tr>
			<td>Übersetzung</td>
			<td class="fragment">Nativ kompiliert</td>
			<td class="fragment" colspan="2">Bytecode</td>
			<td class="fragment">Interpretiert / kompiliert (JIT)</td>
			</tr>
			<tr>
			<td>Typisierung</td>
			<td colspan="3" class="fragment">statisch</td>
			<td class="fragment">dynamisch</td>
			</tr>
			<tr>
			<td>Speicher-Management</td>
			<td class="fragment">Manuell</td>
			<td class="fragment" colspan="3">Garbage Collector</td>
			</tr>
			</table>
			</section>
			<section>
			<h3>Begrifflichkeiten</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function add(x, y) {
			return x + y;
			}

			const a = 5;
			const b = add(a, 6);
			const c = [];
			</code>
			</pre>
			<div><span class="fragment">Operator, </span><span class="fragment">Aufruf (Call), </span><span class="fragment">Ausdruck (Expression), </span><span class="fragment">Parameter, </span><span class="fragment">Argument, </span><span class="fragment">Literal, </span></div><div><span class="fragment">Zuweisung (Assignment), </span><span class="fragment">Linke Hand (Left hand), Rechte Hand (Right hand)</span></div>
			</section>
			<section>
			<h3>Vorbereiten der Beispiele (bei Bedarf)</h3>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			# im Ordner 'examples/'
			. hooks/post-checkout
			</code>
			</pre>
			</section>
			<section>
			<h3>Ausführung</h3>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			# node [Script-Datei], z.B.
			node index.js
			</code>
			</pre>
			</section>
			<section>
			<h3>Ausgaben</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			console.log("Hello World!");
			</code>
			</pre>
			</section>

			<section>
			<h3>Variablen</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			// < es6
			var x = 1;

			// >= es6
			let y = 2;
			const z = 3;
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			var yes = false;

			if (yes) {
			var a = 1;
			}

			console.log(a);
			</code>
			</pre>
			<pre class="fragment">
			<code class="bash" data-trim data-line-numbers>
			undefined
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			var yes = false;

			if (yes) {
			let a = 1;
			}

			console.log(a);
			</code>
			</pre>
			<pre class="fragment">
			<code class="bash" data-trim data-line-numbers>
			ReferenceError: a is not defined
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function foo() {
			var yes = false;

			if (yes) {
			var a = 1;
			}
			}

			foo();

			console.log(a);
			</code>
			</pre>
			<pre class="fragment">
			<code class="bash" data-trim data-line-numbers>
			ReferenceError: a is not defined
			</code>
			</pre>
			</section>
			<section>
			<h3><code>var</code></h3>
			<ul>
			<li>hat <code>function</code>-Scope</li>
			<li>wird durch <span class="italic">hoisting</span> ("hochziehen") aus dem Block heraus an den Start der Funktion gezogen</li>
			</ul>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			var yes = false;
			var a;

			if (yes) {
			a = 1;
			}

			console.log(a);
			</code>
			</pre>
			</section>
			<section>
			<h3><code>let</code>, <code>const</code></h3>
			<ul>
			<li>haben intuitiven Block-Scope (wie viele andere Programmiersprachen auch)</li>
			<li>daher nur an Ort und Stelle gültig in der angegebenen Reihenfolge</li>
			</ul>
			</section>
			<section>
			<h3>Datentypen</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			let x = 5; // Number (Integer)
			let f = 1.25; // Number (Float)
			let b = true; // Boolean
			let s = "hallo"; // String
			let a = []; // Array
			let o = {}; // Objekt
			let nan = NaN; // Not a Number
			let n = null; // Null
			let u = undefined; // Undefiniert
			</code>
			</pre>
			</section>
			<section>
			<h3>Alternation</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			if (x == 1) {
			// Code
			}
			else if (x == 2) {
			// alternativer Code
			}
			else {
			// Fallback
			}
			</code>
			</pre>
			</section>
			<section>
			<h3>Schleifen</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			for (let i = 0; i < 5; i++) {
			// Code
			}
			</code>
			</pre>
			<pre>
			<code class="js" data-trim data-line-numbers>
			const a = [1, 2, 3];

			for (const element of a) {
			// Code
			}
			</code>
			</pre>
			<pre>
			<code class="js" data-trim data-line-numbers>
			while (i == 1) {
			// Code
			}
			</code>
			</pre>
			<pre>
			<code class="js" data-trim data-line-numbers>
			do {
			// Code
			} while (i == 1)
			</code>
			</pre>
			</section>
			<section>
			<h3>Arrays</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			let a = [1, 2, 3];

			a.push(4);
			a.push(5);

			a.pop();

			console.log(a);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			[1, 2, 3, 4]
			</code>
			</pre>
			</section>
			<section>
			<h3>Objekte</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			let o = {x: 1, y: 2};

			console.log(o.z);

			console.log(o);

			o.z = 3;

			console.log(o);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			undefined
			{ x: 1, y: 2 }
			{ x: 1, y: 2, z: 3 }
			</code>
			</pre>
			</section>
			<section>
			<div>Objekte funktionieren intern wie Hash-Maps</div>
			<pre>
			<code class="js" data-trim data-line-numbers>
			let o = {};

			o.a = 1;
			o["a"] = 1; // alternativ

			o["$ !"] = 2; // so sind auch komplexe Schlüssel möglich

			// o."$ !" = 2; => Syntaxfehler
			// o.$ ! = 2; => Syntaxfehler

			o[true] = 3;

			console.log(Object.keys(o));
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			[ 'a', '$ !', 'true' ]
			</code>
			</pre>
			</section>
			<section>
			<h3>Funktionen</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function foo() {
			console.log("foo");
			}

			function bar(a) {
			return a;
			}

			foo();

			const a = bar(1);

			console.log(a);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			foo
			1
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			let sum = function(a, b) {
			return a + b;
			}

			let subtract = function() {
			console.log(arguments);

			return arguments[0] - arguments[1];
			}

			console.log(sum(1, 2));
			console.log(subtract(1, 2));
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			3
			[Arguments] { '0': 1, '1': 2 }
			-1
			</code>
			</pre>
			</section>
			<section>
			<h3>Funktionen als Konstruktor</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function Rectangle(a, b) {
			this.a = a;
			this.b = b;
			}

			const r = new Rectangle(2, 3);

			console.log(r.a);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			2
			</code>
			</pre>
			</section>
			<section>
			<h3>Objektorientierung</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function Rectangle(a, b) {
			this.a = a;
			this.b = b;
			}

			// jede Funktion besitzt einen Prototypen
			Rectangle.prototype.getArea = function() {
			return this.a * this.b;
			}

			const r1 = new Rectangle(2, 3);
			const r2 = new Rectangle(4, 5);

			console.log(r1.getArea());
			console.log(r2.getArea());
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			6
			20
			</code>
			</pre>
			</section>
			<section>
			<img data-src="/assets/images/constructor-and-its-prototype.svg">
			</section>
			<section>
			<div>Dynamische Änderung des Prototypen</div>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function Rectangle(a, b) {
			this.a = a;
			this.b = b;
			}

			const r = new Rectangle(2, 3);

			console.log(r.getArea);

			Rectangle.prototype.getArea = function() {
			return this.a * this.b;
			}

			console.log(r.getArea);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			undefined
			[Function (anonymous)]
			</code>
			</pre>
			</section>
			<section>
			<h3>Aufgabe</h3>
			Bringe dem Array eine Methode bei, welche die Summe aller enthaltenen Zahlen zurückgibt
			<pre>
			<code class="js" data-trim data-line-numbers>
			const a = [1, 2, 3];

			console.log(a.sum());
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			6
			</code>
			</pre>
			</section>
			<section>
			<h3>Lösung</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			Array.prototype.sum = function() {
			let sum = 0;

			for (let number of this) {
			sum += number;
			}

			return sum;
			}
			</code>
			</pre>
			</section>
			<section>
			<h3>Vererbung</h3>
			<pre>
			<code class="js" data-trim data-line-numbers="1-13\|15-18\|20-29">
			// Oberklasse
			function Shape() {
			}

			Shape.prototype.getType = function() {
			return "Shape";
			}

			// Unterklasse
			function Rectangle(a, b) {
			this.a = a;
			this.b = b;
			}

			// Prototype der Oberklasse in die Unterklasse kopieren
			Rectangle.prototype = Object.create(Shape.prototype);
			// Konstruktor der Oberklasse am Prototypen durch den eigenen ersetzen
			Rectangle.prototype.constructor = Rectangle;

			const r = new Rectangle(2, 3);

			console.log(r.getType());

			// .getType() selber implementieren
			Rectangle.prototype.getType = function() {
			return "Rectangle";
			}

			console.log(r.getType());
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			Shape
			Rectangle
			</code>
			</pre>
			</section>
			<section>
			<img data-src="/assets/images/inheritance-es5.svg">
			</section>
			<section>
			<div>
			<img width="800" height="500" data-src="/assets/images/mdn-prototype.jpg">
			</div>
			<p>
			<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/push" style="font-size: 16px">https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/push</a>
			</p>
			</section>
			<section>
			<h3>Objektorientierung in es6</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			class Rectangle {
			constructor(a, b) {
			this.a = a;
			this.b = b;
			}

			getArea() {
			return this.a * this.b;
			}
			}

			const r = new Rectangle(2, 3);

			console.log(r.getArea());
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			6
			</code>
			</pre>
			</section>
			<section>
			<h3>Vererbung in es6</h3>
			<pre>
			<code class="js" data-trim data-line-numbers="1-6\|8-16\|18-27">
			// Oberklasse
			class Shape {
			getType() {
			return "Shape";
			}
			}

			// Unterklasse erbt von Oberklasse
			class Rectangle extends Shape {
			constructor(a, b) {
			super();

			this.a = a;
			this.b = b;
			}
			}

			const r = new Rectangle(2, 3);

			console.log(r.getType());

			// Implementierung per Prototype weiterhin möglich, falls man so will
			Rectangle.prototype.getType = function() {
			return "Rectangle";
			}

			console.log(r.getType());
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			Shape
			Rectangle
			</code>
			</pre>
			</section>
			<section>
			<h3>Asynchronität</h3>
			<p>Asynchron: Es wird nicht auf die Beendigung des Befehls gewartet, sondern mit dem Programm fortgefahren. Die Vollendung des asynchronen Befehls tritt <i style="font-style: italic">irgendwann</i> in der Zukunft ein.</p>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			setTimeout(callback, time); // Ausführung nach [time] Millisekunden
			setInterval(callback, interval); // Ausführung alle [interval] Millisekunden
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			setTimeout(function() {
			// Code, der nach 2 Sekunden ausgeführt wird
			console.log("zweiter");
			}, 2000);

			console.log("erster");
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			erster
			zweiter
			</code>
			</pre>
			</section>
			<section>
			<p>Aufgabe: Schreibe ein Programm, das zwei weitere beliebige Texte mit jeweils 2 Sekunden Verzögerung von einander ausgibt, d.h.</p>
			<p>"erster" -> 2s -> "zweiter" -> 2s -> "Text A" -> 2s -> "Text B"</p>
			<pre>
			<code class="js" data-trim data-line-numbers>
			setTimeout(function() {
			console.log("zweiter");

			// weiterer Code
			}, 2000);

			console.log("erster");
			</code>
			</pre>
			</section>
			<section>
			Lösung: Callback-Hell oder Pyramide des Todes
			<pre>
			<code class="js" data-trim data-line-numbers>
			setTimeout(function() {
			console.log("zweiter");

			setTimeout(function() {
			console.log("Text A");

			setTimeout(function() {
			console.log("Text B");


			}, 2000);
			}, 2000);
			}, 2000);

			console.log("erster");
			</code>
			</pre>
			</section>
			<section>
			Hilfsmittel: Promises
			<pre>
			<code class="js" data-trim data-line-numbers>
			new Promise(function (resolve, reject) {
			// ich bin fertig
			resolve();

			// es ist ein Fehler aufgetreten
			reject();
			});
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			const p = new Promise(function (resolve, reject) {...});
			const p2 = new Promise(function (resolve, reject) {...});
			const p3 = new Promise(function (resolve, reject) {...});
			const p4 = new Promise(function (resolve, reject) {...});

			p
			.then(function() { return p2; })
			.then(function() { return p3; })
			.then(function() { return p4; });
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			console.log("erster");

			delay(2000)
			.then(function () {
			console.log("zweiter");

			return delay(2000);
			})
			.then(function() {
			console.log("Text A");

			return delay(2000);
			})
			.then(function() {
			console.log("Text B");
			})
			</code>
			</pre>
			</section>
			<section>
			Aufgabe: Implementiere die Funktion "delay"
			<pre>
			<code class="js" data-trim data-line-numbers>
			const delay = function() {
			// implementieren
			}

			console.log("erster");

			delay(2000)
			.then(function () {
			console.log("zweiter");

			return delay(2000);
			})
			.then(function() {
			console.log("Text A");

			return delay(2000);
			})
			.then(function() {
			console.log("Text B");
			})
			</code>
			</pre>
			</section>
			<section>
			Lösung:
			<pre>
			<code class="js" data-trim data-line-numbers>
			const delay = function(ms) {
			return new Promise(function(resolve, reject) {
			setTimeout(function() {
			resolve();
			}, ms);
			});
			}

			console.log("erster");

			delay(2000)
			.then(function () {
			console.log("zweiter");

			return delay(2000);
			})
			.then(function() {
			console.log("Text A");

			return delay(2000);
			})
			.then(function() {
			console.log("Text B");
			})
			</code>
			</pre>
			</section>
			<section>
			Rückgabewerte mit Promises
			<pre>
			<code class="js" data-trim data-line-numbers>
			const p = new Promise(function(resolve, reject) {
			resolve("ok");
			});

			p.then(function(value) {
			console.log(value);
			});
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			ok
			</code>
			</pre>
			</section>
			<section>
			Fehlerbehandlung mit Promises
			<pre>
			<code class="js" data-trim data-line-numbers>
			const p = new Promise(function(resolve, reject) {
			reject(new Error("Fehler"));
			});

			p
			.then(function() {
			console.log("Ich werde nicht aufgerufen")
			})
			.catch(function(e) {
			console.log(e.message);
			});
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			Fehler
			</code>
			</pre>
			</section>
			<section>
			Datei lesen mit NodeJS
			<pre>
			<code class="js" data-trim data-line-numbers>
			const fs = require("fs");

			fs.readFile("./hello.txt", {encoding: "utf8"}, function(error, data) {
			console.log(data);
			});
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			Hello World!
			</code>
			</pre>
			</section>
			<section>
			Aufgabe: "Promisifiziere" analog zu "delay" in der letzten Aufgabe den Aufruf von fs.readFile()
			<pre>
			<code class="js" data-trim data-line-numbers>
			const fs = require("fs");

			function readFile() {
			// implementieren
			}

			readFile("./hello.txt").then(function(content) {
			console.log(content);
			});
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			Hello World!
			</code>
			</pre>
			</section>
			<section>
			Lösung:
			<pre>
			<code class="js" data-trim data-line-numbers>
			const fs = require("fs");

			function readFile(path) {
			return new Promise(function (resolve, reject) {
			fs.readFile(path, {encoding: "utf8"}, function(error, data) {
			resolve(data);
			});
			});
			}

			readFile("./hello.txt").then(function(content) {
			console.log(content);
			});
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			Hello World!
			</code>
			</pre>
			</section>
			<section>
			Aufgabe: Nutze die vorherige Lösung nun für eine Promise-Kette, sodass die Inhalte der zwei Dateien "hello.txt" und "hallo.txt" nacheinander ausgegeben werden:
			<pre>
			<code class="bash" data-trim data-line-numbers>
			Hello World!

			Hallo Welt!

			</code>
			</pre>
			</section>
			<section>
			Lösung:
			<pre>
			<code class="js" data-trim data-line-numbers>
			const fs = require("fs");

			function readFile(path) {
			return new Promise(function (resolve, reject) {
			fs.readFile(path, {encoding: "utf8"}, function(error, data) {
			resolve(data);
			});
			});
			}

			readFile("./hello.txt")
			.then(function(content) {
			console.log(content);

			return readFile("./hallo.txt");
			})
			.then(function(content) {
			console.log(content);
			});
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			Hello World!

			Hallo Welt!
			</code>
			</pre>
			</section>
			<section>
			<h3>Async - Await</h3>
			<ul>
			<li>Syntaktischer Zucker für Promises</li>
			<li>Nutzung von <code>await</code> nur im Kontext einer <code>async</code>-Funktion möglich</li>
			</ul>
			<pre>
			<code class="js" data-trim data-line-numbers>
			async function wrapper() {
			const p = new Promise(function(resolve, reject) {
			resolve("Hello from Promise!");
			});

			const result = await p;

			console.log(result);
			}

			wrapper();
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			Hello from Promise!
			</code>
			</pre>
			</section>
			<section>
			Aufgabe: Schreibe die Lösung der vorherigen Aufgabe nach Async - Await um
			</section>
			<section>
			Lösung:
			<pre>
			<code class="js" data-trim data-line-numbers>
			const fs = require("fs");

			function readFile(path) {
			return new Promise(function (resolve, reject) {
			fs.readFile(path, {encoding: "utf8"}, function(error, data) {
			resolve(data);
			});
			});
			}

			async function wrapper() {
			const content1 = await readFile("./hello.txt");
			const content2 = await readFile("./hallo.txt");

			console.log(content1);
			console.log(content2);
			}

			wrapper();
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			Hello World!

			Hallo Welt!
			</code>
			</pre>
			</section>
			<section>
			<h3>Destructuring</h3>
			<p>Auflösen von komplexen Strukturen</p>
			<pre>
			<code class="js" data-trim data-line-numbers>
			// Objekt destrukturieren (per Attribut-Namen)
			const { a, b } = { a: 1, b: 2 };

			console.log(a);
			console.log(b);

			// Array destrukturieren (per Position)
			const [ c, d ] = [3, 4];

			console.log(c);
			console.log(d);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			1
			2
			3
			4
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			// Bei Objekten Elemente umbenennen oder auch auslassen
			const { a: x, b: y } = { a: 1, b: 2, c: 3 };

			console.log(x);
			console.log(y);

			// Bei Arrays Elemente auslassen
			const [ , a, b, , c] = [3, 4, 5, 6, 7, 8];

			console.log(a);
			console.log(b);
			console.log(c);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			1
			2
			4
			5
			7
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			// Verschachteltes Destructuring
			const {a: [, x, ] } = { a: [0, 1, 2]};

			console.log(x);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			1
			</code>
			</pre>
			</section>
			<section>
			Aufgabe: x soll die 5 enthalten
			<pre>
			<code class="js" data-trim data-line-numbers>
			const o = { a: [0, {b: [0, 5]}, 2]};

			const { /* Destructuring-Ausdruck */ } = o;

			console.log(x);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			5
			</code>
			</pre>
			</section>
			<section>
			Lösung:
			<pre>
			<code class="js" data-trim data-line-numbers>
			const o = { a: [0, { b: [0, 5] }, 2]};

			const { a: [, { b: [, x] }]} = o;

			console.log(x);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			5
			</code>
			</pre>
			</section>
			<section>
			Aufgabe: x soll die 3 enthalten
			<pre>
			<code class="js" data-trim data-line-numbers>
			const o = { a: [0, {b: [0, { c: [{ x: 5 }, { d: 3}] }]}, 2]};

			const { /* Destructuring-Ausdruck */ } = o;

			console.log(x);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			3
			</code>
			</pre>
			</section>
			<section>
			Lösung:
			<pre>
			<code class="js" data-trim data-line-numbers>
			const o = { a: [0, {b: [0, { c: [{ x: 5 }, { d: 3}] }]}, 2]};

			const { a: [, {b: [, { c: [, { d: x}] }] }] } = o;

			console.log(x);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			3
			</code>
			</pre>
			</section>
			<section>
			<p>Destructuring zum parallelen Ausführen von mehreren Promises</p>
			<pre>
			<code class="js" data-trim data-line-numbers="1-10\|11-21">
			const fs = require("fs");

			function readFile(path) {
			return new Promise(function (resolve, reject) {
			fs.readFile(path, {encoding: "utf8"}, function(error, data) {
			resolve(data);
			});
			});
			}

			async function wrapper() {
			const [ content1, content2 ] = await Promise.all([
			readFile("./hello.txt"),
			readFile("./hallo.txt")
			]);

			console.log(content1);
			console.log(content2);
			}

			wrapper();
			</code>
			</pre>
			</section>
			<section>
			<h3>Try-Catch-Finally</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function throwError() {
			try {
			throw new Error("Fehler!");
			return "Hello World!";
			}
			catch (e) {
			return e.message;
			}
			finally {
			console.log("Finally wird immer ausgeführt");
			return "Finally!";
			}
			}

			const result = throwError();
			console.log(result);
			</code>
			</pre>
			<pre class="fragment">
			<code class="bash" data-trim data-line-numbers>
			Finally wird immer ausgeführt
			Finally!
			</code>
			</pre>
			</section>
			<section>
			<p>Anwendungsbeispiel für Try-Catch-Finally</p>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function readFromDatabase() {
			try {
			db.connect();
			return db.read();
			}
			catch (e) {
			console.log(e.stack);
			return "";
			}
			finally {
			if (db.open) {
			db.close();
			}
			}
			}
			</code>
			</pre>
			</section>
			<section>
			<h3>Scope</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function a() {
			const x = 5;

			return function() {
			return x * x;
			};
			}

			const squareX = a();
			const result = squareX();

			console.log(result);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			25
			</code>
			</pre>
			</section>
			<section>
			<h3>this</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			class MyClass {
			constructor(a) {
			this.a = a;
			}

			getA() {
			return this.a;
			}
			}

			const x = new MyClass(5);
			const y = new MyClass(10);

			console.log(x.getA());
			console.log(y.getA());
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			5
			10
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			global.a = 5;

			function foo() {
			this.a += 10;
			}

			foo();

			console.log(a);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			15
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			class MyClass {
			/* ... */
			setA() {
			function f() {
			this.a += 100;
			}
			f();
			}
			}

			const x = new MyClass(5);

			x.setA();

			console.log(x.getA());
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			TypeError: Cannot read property 'a' of undefined
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			class MyClass {
			/* ... */
			setA() {
			const me = this;
			function f() {
			me.a += 100;
			}
			f();
			}
			}

			const x = new MyClass(5);

			x.setA();

			console.log(x.getA());
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			105
			</code>
			</pre>
			</section>
			<section>
			<h3>Arrow-Funktionen</h3>
			<ul>
			<li>Kompakte Schreibweise einer normalen Funktion</li>
			<li>Bei Einzeilern ist das <code>return</code> nicht notwendig</li>
			<li>this-Pointer des aktuellen Kontextes wird beibehalten</li>
			</ul>
			<pre>
			<code class="js" data-trim data-line-numbers>
			// Einzeiler
			const f1 = _ => 1;
			const f2 = () => 1;
			const f3 = (x) => x * x;
			const f4 = (x, y) => x + y;

			// Mehrzeiler
			const f5 = (x, y) => {
			return x * y;
			};
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			class MyClass {
			/* ... */
			setA() {
			const f = () => {
			this.a += 100;
			}
			f();
			}
			}

			const x = new MyClass(5);

			x.setA();

			console.log(x.getA());
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			105
			</code>
			</pre>
			</section>
			<section>
			<h3>Generator-Funktionen</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function* generator() {
			let i = 0;

			while(true) {
			yield i;
			i++;
			}
			}

			const g = generator();

			console.log(g.next().value);
			console.log(g.next().value);
			console.log(g.next().value);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			1
			2
			3
			</code>
			</pre>
			</section>
			<section>
			<h3>Generator-Funktionen</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function* generator() {
			yield 1;
			yield 2;
			yield 3;
			}

			const g = generator();

			for (const i of g) {
			console.log(i);
			}
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			1
			2
			3
			</code>
			</pre>
			</section>
			<section>
			<h3>Nützliche Array-Funktionen</h3>
			</section>
			<section>
			Aufgabe: Schreibe ein Programm, das den Gesamtumsatz aus dem ersten Halbjahr berechnet
			<pre>
			<code class="js" data-trim data-line-numbers>
			const revenues = [
			{month: 0, revenue: 1000},
			{month: 1, revenue: 2000},
			{month: 2, revenue: 3000},
			{month: 3, revenue: 4000},
			{month: 4, revenue: 5000},
			{month: 5, revenue: 6000},
			{month: 6, revenue: 6000},
			{month: 7, revenue: 5000},
			{month: 8, revenue: 4000},
			{month: 9, revenue: 3000},
			{month: 10, revenue: 2000},
			{month: 11, revenue: 1000}
			];

			let totalRevenue = 0;

			/* ... */

			console.log(totalRevenue);
			</code>
			</pre>
			</section>
			<section>
			Lösung
			<pre>
			<code class="js" data-trim data-line-numbers>
			totalRevenue = revenues
			.filter((revenue) => revenue.month < 6)
			.map((revenue) => revenue.amount)
			.reduce((sum, amount) => sum + amount, 0);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			21000
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			const a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

			a.filter((e) => e > 2); // Filterung
			a.map((e) => e * 2); // Umformung
			a.reduce((p, e) => p + e, 0); // Zusammenrechnung / Reduzierung
			a.some((e) => e > 5); // true wenn min. ein Element die Bedingung erfüllt
			a.every((e) => e > 5); // true wenn alle Elemente die Bedingung erfüllen
			</code>
			</pre>
			</section>
			<section>
			<h3>Map</h3>
			<ul>
			<li>auch als "assoziatives Array" bezeichnet</li>
			<li>iterierbare Liste</li>
			<li>ideal zur Assoziation von z.B. Hashes zu Objekt-Instanzen o.ä.</li>
			<li>nutzbar ab es6 / es2015</li>
			<li>löst herkömmliche Objekte als Hash-Map ab</li>
			</ul>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			const m = new Map();

			m.set("a", 0);
			m.set("a", 1);
			m.set("b", 2);

			m.has("c"); // => false

			m.delete("b");

			console.log(m.get("a")); // => 1
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			m.forEach((k, v) => console.log(k, v)) // => "a" 1 ...

			for (const entry of m.entries()) {
			console.log(entry); // => ["a", 1] ...
			}

			for (const key of m.keys()) {
			console.log(key); // => "a" ...
			}

			for (const value of m.values()) {
			console.log(value); // => "1" ...
			}
			</code>
			</pre>
			</section>
			<section>
			<h3>Set</h3>
			<ul>
			<li>enthält nur einzigartige Werte</li>
			<li>iterierbare Liste</li>
			<li>ideale Struktur, wenn einzelne Werte einzigartig sein sollen</li>
			<li>nutzbar ab es6 / es2015</li>
			<li>löst individuelle Lösungen mittels Arrays und Array.prototype.indexOf o.ä. ab</li>
			</ul>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			const s = new Set();

			s.add("a");
			s.add("a");

			s.has("c"); // => false

			s.delete("a");

			console.log(s.size); // => 0
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			s.forEach((k, v) => console.log(k, v)) // => "a" "a" ...

			for (const entry of m.entries()) {
			console.log(entry); // => ["a", "a"] ...
			}

			for (const key of m.keys()) {
			console.log(key); // => "a"...
			}

			for (const value of s.values()) {
			console.log(value); // => "a" ...
			}
			</code>
			</pre>
			</section>
			<section>
			<h3>DOM-Events</h3>
			<ul>
			<li>funktionale Ausführung von Code</li>
			<li>Trigger können Klicks, Scrollen, Tastendrücke, Änderungen der Fenstergröße usw. sein</li>
			</ul>
			</section>
			<section>
			<img data-src="/assets/images/dom-events.svg">
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function doSomething(e) {
			console.log("capture");
			}

			function click(e) {
			console.log("bubble");
			}

			div.addEventListener("click", doSomething, true);

			button.addEventListener("click", click, false /* default */);
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			capturing
			bubble
			</code>
			</pre>
			</section>
			<section>
			<p>Aufgabe: Erweitere das vorherige Beispiel so, dass das div-Element einen weiteren Click-Handler bekommt,
			der den Text "bubble2" anzeigt, nachdem "bubble" in der Konsole geloggt wurde.</p>

			<p>Erwartete Ausgabe:</p>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			capturing
			bubble
			bubble2
			</code>
			</pre>
			</section>
			<section>
			<p>Lösung:</p>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function doSomething(e) {
			console.log("capture");
			}

			// neu
			function doSomething2(e) {
			console.log("bubble2");
			}

			function click(e) {
			console.log("bubble");
			}

			div.addEventListener("click", doSomething, true);
			div.addEventListener("click", doSomething2, false); // neu

			button.addEventListener("click", click, false /* default */);
			</code>
			</pre>
			</section>
			<section>
			Die Bubble-Phase stoppen
			<pre>
			<code class="js" data-trim data-line-numbers>
			function click(e) {
			e.stopPropagation()
			}
			</code>
			</pre>
			</section>
			<section>
			<p>Aufgabe: Ändere das Ergebnis des vorherigen Beispiels, sodass die Bubble-Phase auf Ebene des button-Elements gestoppt wird. Was ändert sich in der Ausgabe?</p>
			</section>
			<section>
			<p>Lösung:</p>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function doSomething(e) {
			console.log("capture");
			}

			function doSomething2(e) {
			console.log("bubble2");
			}

			function click(e) {
			e.stopPropagation();
			console.log("bubble");
			}

			div.addEventListener("click", doSomething, true);
			div.addEventListener("click", doSomething2, false);

			button.addEventListener("click", click, false /* default */);
			</code>
			</pre>
			</section>
			<section>
			Events programatisch triggern:
			<pre>
			<code class="js" data-trim data-line-numbers>
			button.dispatchEvent(new Event("click"));
			</code>
			</pre>
			</section>
			<section>
			Events sind synchron:
			<pre>
			<code class="js" data-trim data-line-numbers>
			doSomethingElse();

			button.dispatchEvent(new Event("click"));

			doAnotherThing(); // wird erst ausgeführt, wenn zuvor alle Event-Handler fertig sind
			</code>
			</pre>
			</section>
			<section>
			<h3>Strings</h3>
			<pre>
			<code class="js" data-trim data-line-numbers>
			const empty1 = "";
			const empty1 = '';

			const s1 = 'abc';
			const s2 = "abc";

			const s3 = 'a"b"c';
			const s4 = "a\"b\"c";

			const s5 = 'a\'b\'c';
			const s6 = "a'b'c";

			const s7 = `a'b'"c"`;
			</code>
			</pre>
			</section>
			<section>
			<h5>Strings zusammenfügen</h5>
			<pre>
			<code class="js" data-trim data-line-numbers>
			const age = 10;

			// Konkatenation
			const s = "My age is " + number + "!";

			// Interpolation
			const s = `My age is ${number}!`;

			// => "My age is 10!"
			</code>
			</pre>
			</section>
			<section>
			<h5>Template Strings</h5>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function sayHello() {
			return "Hello";
			}

			let interpolation = `${sayHello()}`;

			// => "Hello"

			interpolation = `5 + 5 = ${5+5}`;

			// => "5 + 5 = 10"
			</code>
			</pre>
			</section>
			<section>
			lit
			<pre>
			<code class="js" data-trim data-line-numbers>
			return html`<div>hello world!</div>`
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function myTag() {
			console.log(arguments);

			// return 5;
			// return true;
			return "abc";
			}

			let interpolation = myTag`a ${5} b ${6} c`;

			// => "abc"
			</code>
			</pre>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			Arguments(3) [Array(3), 5, 6]
			0 : (3) ['a ', ' b ', ' c', raw: Array(3)]
			1 : 5
			2 : 6
			</code>
			</pre>
			</section>
			<section>
			<h5>Aufgabe</h5>
			<p>Schreibe ein Tag, welches die Zahlen aus den dynamischen Ausdrücken zusammenrechnet (<code>strings.js</code>)</p>
			</section>
			<section>
			<h5>Lösung</h5>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function add(parts, ...numbers) {
			return numbers.reduce((p, c) => p + c, 0);
			}

			let sum = add`a ${5} b ${6} c`;

			console.log(sum);

			// => 11
			</code>
			</pre>
			</section>
			<section>
			<h5>Rest-Operator</h5>
			<pre>
			<code class="js" data-trim data-line-numbers>
			function add(...numbers) {
			return numbers.reduce((p, c) => p + c, 0);
			}

			add(1, 2, 3); // => 6
			</code>
			</pre>
			<pre>
			<code class="js" data-trim data-line-numbers>
			const o1 = {a: 1, b: 2};
			const o2 = {x: 5, y: 6, ...o1};
			</code>
			</pre>
			<pre>
			<code class="js" data-trim data-line-numbers>
			const a1 = [4, 5, 6];
			const a2 = [1, 2, 3, ...a1];
			</code>
			</pre>
			</section>
			<section>
			<h3>Relevante Browser-APIs</h3>
			</section>
			<section>
			<h5>window</h5>
			<pre>
			<code class="js" data-trim data-line-numbers>
			window.innerWidth; // innere Auflösung des sichtbaren Fensters
			window.innerHeight;
			window.outerWidth; // äußere Auflösung des Browserfensters inklusive Adresszeile usw.
			window.outerHeight;

			window.addEventListener(); // Events an das äußerste "Dach"-Element hängen
			</code>
			</pre>
			</section>
			<section>
			<h5>location</h5>
			<pre>
			<code class="js" data-trim data-line-numbers>
			location.href; // aktuelle URL
			location.host; // aktuelle Domain, z.B. "www.google.de"
			location.protocol; // aktuelles Protokoll, z.B. "https:"
			</code>
			</pre>
			</section>
			<section>
			<h5>Navigator</h5>
			<pre>
			<code class="js" data-trim data-line-numbers>
			navigator.language; // bevorzugte Browsersprache, z.B. "de"
			navigator.userAgent; // z.B. "Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) [...]"
			navigator
			.mediaDevices
			.getDisplayMedia(); // Fordere Erlaubis zum Streamen von Anwendungen oder Bildschirmen an
			</code>
			</pre>
			</section>
			<section>
			<h5>Document</h5>
			<pre>
			<code class="js" data-trim data-line-numbers>
			document.body; // <body>-Element der Seite
			document.activeElement; // aktives Element der Seite, welche gerade den Fokus besitzt
			document.cookie; // für die aktuelle Seite gesetzte Cookies
			document.execCommand("copy"); // Texte in die Zwischenablage zu schreiben
			document.createElement("div"); // erzeuge neues DOM-Element mit angegebenen Tag
			</code>
			</pre>
			</section>
			<section>
			<h5>LocalStorage</h5>
			<pre>
			<code class="js" data-trim data-line-numbers>
			// auf 5MB Daten pro Domain begrenzt
			localStorage.getItem(key); // Element holen
			localStorage.setItem(key, value); // Element setzen
			localStorage.removeItem(key); // Element entfernen
			</code>
			</pre>
			</section>
			</section>
			<section>
			<section>
			<h2>CSS</h2>
			<img data-src="/assets/images/css-sucks.png">
			</section>
			<section>
			<h3>Warum CSS?</h3>
			<ul>
			<li>Erhöhte Zugänglichkeit des Inhalts</li>
			<li>Wiederverwendbarkeit</li>
			</ul>
			</section>
			<section>
			<h3>Syntax</h3>
			<pre>
			<code class="css" data-trim data-line-numbers>
			selector [, selector2, selector3, ...] {
			property1: value;
			property2: value;
			}
			</code>
			</pre>
			</section>
			<section>
			<h3>Beispiel</h3>
			<pre>
			<code class="css" data-trim data-line-numbers>
			html, body {
			width: 100%;
			height: 100%;
			margin: 0;
			}
			</code>
			</pre>
			</section>
			<section>
			<h3>Selektoren</h3>
			<pre>
			<code class="css" data-trim data-line-numbers>
			/* Elemente */
			html, body {...}

			/* IDs */
			#my-id {...}

			/* Klassen */
			.my-class {...}

			/* Pseudo-Klassen */
			div:hover {...}

			/* Attribute */
			div[my-attribut="abc"] {...}

			/* Kombinationen */
			div.my-class#my-id {...}
			</code>
			</pre>
			</section>
			<section>
			<h3>Variablen</h3>
			<pre>
			<code class="css" data-trim data-line-numbers>
			html {
			--my-background-color: #abcdef;
			}

			html div {
			background-color: var(--my-background-color, white);
			}
			</code>
			</pre>
			</section>
			<section>
			<h3>Das <code>display</code>-Attribut</h3>
			</section>
			<section>
			<p>block</p>
			<img data-src="/assets/images/css-display-block.svg">
			<ul>
			<li>untereinander angeordnet</li>
			<li>nehmen sich die volle Breite</li>
			<li><code>width</code> und <code>height</code> möglich</li>
			</ul>
			</section>
			<section>
			<p>inline</p>
			<img data-src="/assets/images/css-display-inline.svg">
			<ul>
			<li>Standard bei <code>Custom Elements</code></li>
			<li>nur so groß wie der content</li>
			<li><code>width</code> und <code>height</code> nicht möglich</li>
			<li>nebeneinander angeordnet</li>
			</ul>
			</section>
			<section>
			<p>inline-block</p>
			<img data-src="/assets/images/css-display-inline-block.svg">
			<ul>
			<li>Mischform von <code>block</code> und <code>inline</code></li>
			<li>nur so groß wie der content</li>
			<li><code>width</code> und <code>height</code> möglich</li>
			<li>nebeneinander angeordnet</li>
			</ul>
			</section>
			<section>
			<p>none</p>
			<img data-src="/assets/images/css-display-none.svg">
			<ul>
			<li>unsichtbar</li>
			<li>Platz wird nicht länger beansprucht, so als wenn das Element nicht im DOM wäre</li>
			</ul>
			</section>
			<section>
			<h3>Das <code>position</code>-Attribut</h3>
			</section>
			<section>
			<p>static</p>
			<img data-src="/assets/images/css-position-static.svg">
			<ul>
			<li>Standard</li>
			<li>Element wird am Ort der Verankerung im HTML dargestellt</li>
			</ul>
			</section>
			<section>
			<p>relative</p>
			<img data-src="/assets/images/css-position-relative.svg">
			<ul>
			<li>Verschiebung zur eigentlichen <code>static</code>-Position, z.B. mittels <code>left: 20px</code></li>
			</ul>
			</section>
			<section>
			<p>absolut</p>
			<img data-src="/assets/images/css-position-absolute.svg">
			<ul>
			<li>relative Verschiebung zum nächsten nicht-<code>static</code>-Parent (sonst <code>window</code>)</li>
			</ul>
			</section>
			<section>
			<h3>Aufgabe</h3>
			<p>Implementiere folgendes Beispiel-Menü</p>
			<iframe data-src="/assets/html/css-menu.html"></iframe>
			</section>
			<section>
			<h3>Lösung</h3>
			<pre>
			<code class="css" data-trim data-line-numbers>
			.menu-item {
			display: inline-block;

			position: relative;
			}

			.menu-item .children {
			display: none;

			position: absolute;
			}

			.menu-item:hover .children {
			display: block;
			}
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="html" data-trim data-line-numbers>
			<script type="text/template">
			<div class="menu">
			<div class="menu-item">Eins</div>
			<div class="menu-item">
			Hover Me!
			<div class="children">
			<div>Item 1</div>
			<div>Item 2</div>
			</div>
			</div>
			<div class="menu-item">Drei</div>
			</div>
			</script>
			</code>
			</pre>
			</section>
			<section>
			<h3>Viewport</h3>
			<pre>
			<code class="html" data-trim data-line-numbers>
			<!DOCTYPE html>
			<html>
			<head>
			<meta charset="utf-8"></meta>
			<meta
			name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"
			>
			</head>
			<body>
			...
			</body>
			</html>
			</code>
			</pre>
			<p>Ein Muss für alle responsiven Seiten</p>
			</section>
			<section>
			<pre>
			<code class="bash" data-trim data-line-numbers="">
			npm install -g http-server
			cd pfad/zum/projekt
			http-server --port 8080
			</code>
			</pre>
			</section>
			<section>
			<h3>Einheiten</h3>
			<pre>
			<code class="css" data-trim data-line-numbers="">
			div {
			width: 1px; /* Pixel */
			width: 1pt; /* Points */
			width: 1em; /* Breite des "M" in der Schriftgröße des Elements */
			width: 1rem; /* Breite des "M" in der Schriftgröße des HTML-Elements */
			width: 1vw; /* Prozent der View Width */
			width: 1%; /* Prozent des Elternelements */

			width: 5fr; /* Fraction (nur im CSS Grid verfügbar) */
			}
			</code>
			</pre>
			</section>
			<section>
			<h3>Aufgabe</h3>
			<p>Größeneinheiten in einer HTML-Datei ausprobieren</p>
			</section>
			<section>
			<h3>CSS Flexbox</h3>
			<pre>
			<code class="css" data-trim data-line-numbers="">
			.container {
			display: flex; /* soll ein flexibler Container sein */
			display: inline-flex;

			flex-direction: column; /* Kinder spaltenweise anordnen */
			flex-direction: row; /* Kinder zeilenweise anordnen */

			align-items: center;
			justify-content: center;

			gap: 20px; /* Abstände zwischen den Achsen */
			}

			.child {
			flex-grow: 1; /* Anteiliger Platz, wenn mehr als nötig da ist */
			flex-shrink: 1; /* Anteiliger Platz, wenn weniger als nötig da ist */
			flex-basis: 20px; /* Grundlage zur Berechnung der finalen Größe */
			order: 1; /* Erlaubt die Darstellung in anderer Reihenfolge als durch das HTML vorgegeben */
			}
			</code>
			</pre>
			</section>
			<section>
			<img data-src="/assets/images/css-flexbox-axes.drawio.svg">
			</section>
			<section>
			<h3>Aufgabe</h3>
			<p>Mit CSS Flexbox rumspielen</p>
			</section>
			</section>
			</div>
			</div>

			@@ -564,7 +3080,7 @@
			hash: true,
			slideNumber: "c/t",
			transition: "fade",


			// Learn about plugins: https://revealjs.com/plugins/
			plugins: [ RevealMarkdown, RevealHighlight, RevealNotes ]
			});