add nodejs intro

Sascha Schulz

2024-06-10 28563b57efe49cc9869ed3bc5d3fd3a6a73afcce

add nodejs intro

 assets/drawio/node-js.drawio

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 assets/images/node-js.svg

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 index.html

@@ -3965,7 +3965,162 @@
                </section>
                <section>
                    <section>
                        <h2>NodeJS</h2>
                    </section>
                    <section>
                        <h3>Was ist NodeJS?</h3>
                        <ul>
                            <li class="fragment">"JavaScript auf dem Server"</li>
                            <li class="fragment">basiert auf der V8-Engine von Google</li>
                            <li class="fragment">Laufzeitumgebung für JavaScript mit eigener API</li>
                        </ul>
                    </section>
                    <section>
                        <img data-src="/assets/images/node-js.svg">
                    </section>
                    <section>
                        <h3>Überblick über die Node-API</h3>
                        <p>Die API ist in viele verschiedene Module aufgeteilt</p>
                        <table>
                            <tr><td>fs</td><td>Dateisystem</td></tr>
                            <tr><td>crypto</td><td>Kryptografie</td></tr>
                            <tr><td>zlib</td><td>Datenkompression</td></tr>
                            <tr><td>http</td><td>Webserver</td></tr>
                            <tr><td>net</td><td>Netzwerk (TCP)</td></tr>
                            <tr><td>tls</td><td>Verschlüsseltes Netzwerk (TCP)</td></tr>
                        </table>
                    </section>
                    <section>
                        <p>Aufruf eines Programmes in der Kommandozeile</p>
                        <pre>
                            <code class="bash" data-trim data-line-numbers>
                                node [Node-Parameter] path/to/script.js [Anwendungsparameter]
                            </code>
                        </pre>
                        <p>z.B.</p>
                        <pre>
                            <code class="bash" data-trim data-line-numbers>
                                node --inspect index.js --port 3000
                            </code>
                        </pre>
                    </section>
                    <section>
                        <p>Einbinden von Modulen</p>
                        <pre>
                            <code class="js" data-trim data-line-numbers>
                                const fs = require("fs");
                            </code>
                        </pre>
                    </section>
                    <section>
                        <p>Aufbau eines Moduls</p>
                        <pre>
                            <code class="js" data-trim data-line-numbers>
                                module.exports = {
                                    foo: 5,
                                    sayHello: function(name) {
                                        return "Hello " + name + "!";
                                    }
                                }
                            </code>
                        </pre>
                        <p>oder</p>
                        <pre>
                            <code class="js" data-trim data-line-numbers>
                                exports.foo = 5;
                                exports.sayHello = function(name) {
                                    return "Hello " + name + "!";
                                };
                            </code>
                        </pre>
                    </section>
                    <section>
                        <p>Aufgabe</p>
                        <p>Schreibe ein Modul, welches eine <code>Square</code>-Klasse zur Verfügung stellt, mit welchem man den Umfang und den Flächeninhalt eines Rechtecks berechnen kann:</p>
                        <pre>
                            <code class="js" data-trim data-line-numbers>
                                const Square = require("./square");
                    
                                const square = new Square(2, 3);
								
                                console.log(square.getArea()); // => 6
                                console.log(square.getPerimeter()); // => 10
                            </code>
                        </pre>
                    </section>
                    <section>
                        <h3>Module für die Kommandozeile</h3>
                        <p>package.json</p>
                        <pre>
                            <code class="bash" data-trim data-line-numbers>
                                npm init -y
                            </code>
                        </pre>
                        <pre>
                            <code class="js" data-trim data-line-numbers>
                                {
                                    ...
                                    "bin": {
                                        "my-command": "./index.js"
                                    }
                                }
                            </code>
                        </pre>
                    </section>
                    <section>
                        <p>index.js</p>
                        <pre>
                            <code class="js" data-trim data-line-numbers>
                                #! /usr/bin/env node
								
                                console.log("Hello world from the command line!");
                            </code>
                        </pre>
                    </section>
                    <section>
                        <p>Installation</p>
                        <pre>
                            <code class="bash" data-trim data-line-numbers>
                                npm install -g path/to/project
                            </code>
                        </pre>
                        z.B.
                        <pre>
                            <code class="bash" data-trim data-line-numbers>
                                npm install -g .
                            </code>
                        </pre>
                    </section>
                    <section>
                        <p>Ausführung</p>
                        <pre>
                            <code class="bash" data-trim data-line-numbers>
                                my-command
                            </code>
                        </pre>
                    </section>
                    <section>
                        <p>Kommandozeilenparameter</p>
                        <pre>
                            <code class="js" data-trim data-line-numbers>
                                console.log(process.argv);
                            </code>
                        </pre>
                        <p>angelehnt an die Parameter aus der Programmiersprache <code>c</code>:</p>
                        <pre>
                            <code class="c" data-trim data-line-numbers>
                                int main(int argc, char *argv[])
                            </code>
                        </pre>
                    </section>
                    <section>
                        <p>Aufgabe</p>
                        <p>Mache das vorherige Programm für die Konsole aufrufbar, sodass die Länge und Breite für das Rechteck per Konsolenargumente übergeben werden können und der Flächeninhalt ausgegeben wird:</p>
                        <pre>
                            <code class="js" data-trim data-line-numbers>
                                my-command 2 3
                            </code>
                        </pre>
                    </section>
                </section>
            </div>