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+## NVM - Node Version Manager
+
+nvm ist ein Versionsmanager für node.js. Über nvm können mehrere unterschiedliche Node Versionen installiert werden. NVM wird über die Konsole aufgerufen und ist mit verschiedenen Shells kompatibel (sh, dash, ksh, zsh, bash).
+
+#### Links
+
+- <https://github.com/coreybutler/nvm-windows> (Win)
+- <https://github.com/nvm-sh/nvm> (Mac OS)
+
+#### Installation Windows
+
+1. Lade den NVM-Installer über folgenden Link herunter: <https://github.com/coreybutler/nvm-windows/releases>
+2. Installiere NVM über den [Installer](https://github.com/coreybutler/nvm-windows/releases/download/1.2.2/nvm-setup.zip)
+3. Sollte vorher bereits NodeJS global ohne NVM installiert worden sein, wird empfohlen die vorherige NodeJS Version zu [deinstallieren](https://stackoverflow.com/a/55300310).
+
+### Installation Mac OS
+
+- Installiere NVM über die Konsole mit:
+
+```bash
+curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.4/install.sh | bash
+```
+
+- Füge den Pfad zum NVM Ordner zur Shell-Config hinzu. (`~/.bash_profile`, `~/.zshrc`, `~/.profile`, or `~/.bashrc`).
+
+```bash
+export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm")"
+[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" # This loads nvm
+```
+
+- Aktuelle Informationen zur Installation findet man unter folgendem Link: <https://github.com/nvm-sh/nvm>
+
+#### Erste Schritte
+
+Sobald NVM erfolgreich installiert wurde kann man über nvm in der Konsole eine neue Node Version mit folgendem Befehl installieren:
+
+```bash
+nvm install [NODE VERSIONSNUMMER]
+```
+
+> Hinweis: Die aktuellste Versionsnummer von NodeJS findet man am einfachsten auf der [NodeJS-Seite](https://nodejs.org/en/)
+
+Installierte Node Versionen auflisten
+
+```bash
+nvm list
+```
+
+Node Version verwenden/wechseln
+
+```bash
+nvm use [NODE VERSIONSNUMMER]
+```
+
+Node Version als Standard einrichten
+
+```bash
+nvm alias default [NODE VERSIONSNUMMER]
+```
+
+## Node.js
+
+### Definition
+
+Node.js® is a JavaScript runtime built on Chrome's V8 JavaScript engine.
+
+## Neues Projekt erstellen
+
+- Über die Konsole in den Projektordner gehen.
+
+Projektordner wechsel über "change directory" (cd)
+
+```bash
+cd [projektpfad]
+```
+
+- Eigene Package.json Datei generieren (nur einmalig bei einem neuen Projekt notwendig.)
+
+```bash
+npm init
+```
+
+- Module installieren, die nur für die Entwicklung benötigt werden. (devDependicies)
+
+| Befehl                                                                   | Zweck                                                                                                                        |
+| ------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------------------------------------------- |
+| `npm install Modul@Version`                                              | installiere Modul in der Version Version (semantic versioning)                                                               |
+| `npm install Modul@Version --save`<br>`npm install Modul@Version -S`     | Modul wird in der Datei `package.json` unter dependencies hinzugefügt (Mittlerweile default)                                 |
+| `npm install Modul@Version --save-dev`<br>`npm install Modul@Version -D` | Modul wird in der Datei `package.json` unter devdependencies hinzugefügt                                                     |
+| `npm install Modul@Version --global`<br>`npm install Modul@Version -g`   | Modul wird global installiert. (Von jedem Ordner aus anwendbar)                                                              |
+| `npm uninstall Modul@Version`                                            | entfernt Modul aus `node_modules`                                                                                            |
+| `npm uninstall Modul@Version --save`                                     | entfernt Modul aus `node_modules` und aus der dependencies- Eigenschaft in der `package.json`.                               |
+| `npm update Modul`                                                       | Aktualisiert Modul auf die neueste Version                                                                                   |
+| `npm update Modul --save`                                                |  Aktualisiert Modul auf die neueste Version und auch die Versionsnummer der dependencies- Eigenschaft in der `package.json`. |
+| `npm init`                                                               | erstellt eine package.json-Datei (der Befehl fragt die Eigenschaften ab)                                                     |
+| `npm init --yes`                                                         | erstellt eine package.json-Datei (der Befehl setzt Default-Werte ein)                                                        |
+| `npm list`                                                               | listet alle installierten Module auf.                                                                                        |
+| `npm search`                                                             | Suchbegriff sucht Module, deren Namen den Suchbegriff enthält                                                                |
+
+# Globale Module
+
+## SASS
+
+### Definition
+
+> Sass is the most mature, stable, and powerful professional grade CSS extension language in the world.
+
+Sass ist eine CSS-Preprocessor Sprache.
+
+```bash
+npm install sass -g
+```
+
+## Liste von verwendeten Modulen
@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
@@ -0,0 +1,17 @@
+## License and terms of use
+
+© Web Professional Institute Inc. All rights reserved.
+
+This material is provided solely for students enrolled in courses offered by Web Professional Institute Inc. By accessing or using this code, you acknowledge that it is strictly for educational use within the context of Web Professional Institute Inc. programs.
+
+**Usage Restrictions:**
+
+- Redistribution, sharing, or copying of this material outside the course environment is strictly prohibited.
+- The content is designed to support your learning objectives and is not authorized for commercial projects, public repositories, or applications beyond the course scope.
+- Unauthorized commercial use or open-source distribution is strictly prohibited and may result in expulsion from the program and legal action.
+
+**Agreement & Rights:**
+
+As a student, you have agreed to these terms as part of your enrollment agreement, which includes additional details on permitted uses, restrictions, and policies. The author and Web Professional Institute Inc. retain all rights to this material, including the code base and instructional content.
+
+For any questions regarding these terms, please contact Web Professional Institute Inc. for clarification.
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <title>Recipe Explorer Dashboard</title>
+    <link rel="stylesheet" href="styles.css" />
+  </head>
+  <body>
+    <h1>Recipe Explorer Dashboard</h1>
+
+    <div id="search-container">
+      <input
+        type="text"
+        id="search-input"
+        placeholder="Search for recipes by name..."
+      />
+      <button id="search-button">Search</button>
+    </div>
+
+    <div id="loading">Loading...</div>
+    <div id="error-message"></div>
+
+    <table id="recipes-table">
+      <thead>
+        <tr>
+          <th>Recipe Name</th>
+          <th>Cuisine</th>
+          <th>Preparation Time (mins)</th>
+        </tr>
+      </thead>
+      <tbody>
+        <!-- Recipe data will be populated here -->
+      </tbody>
+    </table>
+
+    <!-- Modal for Recipe Details -->
+    <div id="recipe-modal" class="modal">
+      <div class="modal-content">
+        <span class="close">&times;</span>
+        <h2 id="modal-title">Recipe Name</h2>
+        <img
+          id="modal-image"
+          src=""
+          alt="Recipe Image"
+          style="border-radius: 10px; max-height: 200px"
+        />
+        <p><strong>Cuisine:</strong> <span id="modal-category"></span></p>
+        <p>
+          <strong>Preparation Time:</strong> <span id="modal-time"></span> mins
+        </p>
+        <p><strong>Ingredients:</strong></p>
+        <ul id="modal-ingredients">
+          <!-- Ingredients will be populated here -->
+        </ul>
+        <p><strong>Instructions:</strong></p>
+        <p id="modal-instructions"></p>
+      </div>
+    </div>
+
+    <script src="scripts.js"></script>
+  </body>
+</html>
@@ -0,0 +1,122 @@
+(() => {
+  // ===== DOM & VARIABLES =====
+  const RECIPES_URL = 'https://dummyjson.com/recipes';
+
+  const searchInput = document.querySelector('#search-input');
+  const searchButton = document.querySelector('#search-button');
+  const recipesTableBody = document.querySelector('#recipes-table tbody');
+  const loadingIndicator = document.querySelector('#loading');
+  const errorMessage = document.querySelector('#error-message');
+
+  const modal = document.querySelector('#recipe-modal');
+  const modalTitle = document.querySelector('#modal-title');
+  const modalImage = document.querySelector('#modal-image');
+  const modalCategory = document.querySelector('#modal-category');
+  const modalTime = document.querySelector('#modal-time');
+  const modalIngredients = document.querySelector('#modal-ingredients');
+  const modalInstructions = document.querySelector('#modal-instructions');
+  const closeModal = document.querySelector('.close');
+
+  let allRecipes = [];
+
+  // ===== INIT =====
+  const init = () => {
+    // TODO: Fetch and display all recipes on initial load
+
+    // Event Listeners
+    closeModal.addEventListener('click', closeModalEvent);
+    window.addEventListener('click', windowClickEvent);
+  };
+
+  // ===== EVENT LISTENERS =====
+  const searchButtonEvent = () => {
+    const query = searchInput.value.trim().toLowerCase();
+    if (query !== '') {
+      // TODO: Implement search functionality
+    } else {
+      // TODO: Display all recipes if search input is empty
+    }
+  };
+
+  // Close Modal Event
+  const closeModalEvent = () => {
+    modal.style.display = 'none';
+  };
+
+  // Close Modal when clicking outside the modal content
+  const windowClickEvent = (event) => {
+    if (event.target == modal) {
+      modal.style.display = 'none';
+    }
+  };
+
+  // ===== FUNCTIONS =====
+  // Fetches all recipes from the API and displays them.
+  const fetchAndDisplayRecipes = async () => {
+    showLoading(true);
+    showError(false, '');
+
+    try {
+      // TODO: Fetch data from API
+    } catch (error) {
+      console.error(error);
+      showError(true, 'An error occurred while fetching recipes.');
+    } finally {
+      showLoading(false);
+    }
+  };
+
+  // Searches for recipes by name and displays the results.
+  const searchRecipes = async (query) => {
+    showLoading(true);
+    showError(false, '');
+
+    try {
+      // TODO: Search for recipes by name
+    } catch (error) {
+      console.error(error);
+      showError(true, 'An error occurred while searching for recipes.');
+    } finally {
+      showLoading(false);
+    }
+  };
+
+  // Displays a list of recipes in the table.
+  const displayRecipes = (recipes) => {
+    clearTable();
+
+    // TODO: Iterate over the recipes and display them in the table
+  };
+
+  // Displays detailed information about a selected recipe in a modal.
+  const showRecipeDetails = (recipe) => {
+    // TODO: Calculate total preparation time
+    // TODO: Set image source
+    // TODO: Populate ingredients
+    // TODO: Show modal
+  };
+
+  // Shows or hides the loading indicator.
+  const showLoading = (show) => {
+    loadingIndicator.style.display = show ? 'block' : 'none';
+  };
+
+  // Displays or hides an error message.
+  const showError = (show, message) => {
+    if (show) {
+      errorMessage.textContent = message;
+      errorMessage.style.display = 'block';
+    } else {
+      errorMessage.textContent = '';
+      errorMessage.style.display = 'none';
+    }
+  };
+
+  // Clears the recipes table.
+  const clearTable = () => {
+    recipesTableBody.innerHTML = '';
+  };
+
+  // ===== CALL INIT =====
+  init();
+})();
@@ -0,0 +1,124 @@
+body {
+  font-family: Arial, sans-serif;
+  margin: 20px;
+}
+
+h1 {
+  text-align: center;
+  color: #4d7c0f;
+}
+
+#search-container {
+  text-align: center;
+  margin-bottom: 20px;
+}
+
+#search-input {
+  width: 300px;
+  padding: 10px;
+  font-size: 16px;
+  border: 2px solid #65a30d;
+  border-radius: 5px;
+}
+
+#search-button {
+  padding: 10px 20px;
+  font-size: 16px;
+  cursor: pointer;
+  background-color: #4d7c0f;
+  color: white;
+  border: none;
+  border-radius: 5px;
+  margin-left: 10px;
+}
+
+#search-button:hover {
+  background-color: #65a30d;
+  transition: 0.1s;
+}
+
+#recipes-table {
+  width: 100%;
+  border-collapse: collapse;
+  margin-bottom: 20px;
+  max-width: 1000px;
+  margin-inline: auto;
+}
+
+#recipes-table th,
+#recipes-table td {
+  border: 1px solid #ddd;
+  padding: 12px;
+  text-align: left;
+}
+
+#recipes-table th {
+  background-color: #4d7c0f;
+  color: white;
+}
+
+#recipes-table tr:nth-child(even) {
+  background-color: #f9f9f9;
+}
+
+#recipes-table tr:hover {
+  background-color: #ecfccb;
+  cursor: pointer;
+}
+
+/* Modal styling */
+.modal {
+  display: none;
+  position: fixed;
+  z-index: 1;
+  padding-top: 100px;
+  left: 0;
+  top: 0;
+  width: 100%;
+  height: 100%;
+  overflow: auto;
+  background-color: rgba(0, 0, 0, 0.4);
+}
+
+.modal-content {
+  background-color: #fff;
+  margin: auto;
+  padding: 20px;
+  border: 1px solid #888;
+  width: 60%;
+  border-radius: 10px;
+  position: relative;
+}
+
+.close {
+  color: #aaa;
+  position: absolute;
+  top: 15px;
+  right: 25px;
+  font-size: 30px;
+  font-weight: bold;
+  cursor: pointer;
+}
+
+.close:hover,
+.close:focus {
+  color: black;
+  text-decoration: none;
+}
+
+/* Loading Indicator */
+#loading {
+  display: none;
+  text-align: center;
+  font-size: 18px;
+  color: #4d7c0f;
+}
+
+/* Error Message */
+#error-message {
+  display: none;
+  text-align: center;
+  color: red;
+  font-size: 18px;
+  margin-bottom: 20px;
+}
@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
@@ -0,0 +1,17 @@
+## License and terms of use
+
+© Web Professional Institute Inc. All rights reserved.
+
+This material is provided solely for students enrolled in courses offered by Web Professional Institute Inc. By accessing or using this code, you acknowledge that it is strictly for educational use within the context of Web Professional Institute Inc. programs.
+
+**Usage Restrictions:**
+
+- Redistribution, sharing, or copying of this material outside the course environment is strictly prohibited.
+- The content is designed to support your learning objectives and is not authorized for commercial projects, public repositories, or applications beyond the course scope.
+- Unauthorized commercial use or open-source distribution is strictly prohibited and may result in expulsion from the program and legal action.
+
+**Agreement & Rights:**
+
+As a student, you have agreed to these terms as part of your enrollment agreement, which includes additional details on permitted uses, restrictions, and policies. The author and Web Professional Institute Inc. retain all rights to this material, including the code base and instructional content.
+
+For any questions regarding these terms, please contact Web Professional Institute Inc. for clarification.
@@ -0,0 +1,76 @@
+'use strict';
+
+const menu = [
+  {
+    category: 'Beverages',
+    items: [
+      { name: 'Coffee', price: 3.5 },
+      { name: 'Tea', price: 2.5 },
+      { name: 'Juice', price: 4 },
+    ],
+  },
+  {
+    category: 'Pastries',
+    items: [
+      { name: 'Croissant', price: 2.75 },
+      { name: 'Muffin', price: 2.5 },
+      { name: 'Bagel', price: 2.25 },
+    ],
+  },
+  {
+    category: 'Sandwiches',
+    items: [
+      { name: 'Ham Sandwich', price: 5.5 },
+      { name: 'Veggie Sandwich', price: 5 },
+      { name: 'Turkey Sandwich', price: 6 },
+    ],
+  },
+];
+
+// ADD YOUR CODE BELOW
+const listMenuItems = (menu) => {};
+
+const calculateAveragePrice = (menu) => {};
+
+const findItemsByCategory = (menu, categoryName) => {};
+
+// ===== TEST CASES (DO NOT MODIFY) =====
+
+// 1. List All Menu Items
+const menuItems = listMenuItems(menu);
+console.log('All Menu Items:\n', menuItems);
+
+// 2. Calculate Average Price
+const averagePrice = calculateAveragePrice(menu);
+console.log('Average Price of All Items:', averagePrice);
+
+// 3. Find Items by Category
+const searchCategory = 'Pastries';
+const pastries = findItemsByCategory(menu, searchCategory);
+console.log(`Items in "${searchCategory}" \nItems:`, pastries);
+
+/*
+===== EXPECTED OUTPUT =====
+
+All Menu Items:
+[
+  'Coffee',
+  'Tea',
+  'Juice',
+  'Croissant',
+  'Muffin',
+  'Bagel',
+  'Ham Sandwich',
+  'Veggie Sandwich',
+  'Turkey Sandwich'
+]
+
+Average Price of All Items: 3.78
+
+Items in "Pastries" 
+Items: [
+  { name: 'Croissant', price: 2.75 },
+  { name: 'Muffin', price: 2.5 },
+  { name: 'Bagel', price: 2.25 }
+]
+*/
@@ -0,0 +1,40 @@
+// Übung 25
+const quotedCSV = '"very big, soft computer mouse","the cutest peripheral ever","10","39.90"';
+
+// Übung 26
+// In der Praxis finden sich auch CSV-Datensätze, in denen manche Felder mit Anführungszeichen umgeben sind und manche nicht.
+
+// Schreibe ein Programm, das auch mit diesen Fällen zurechtkommt. Folgender Datensatz soll korrekt zerlegt werden:
+
+const mixedCSV = '"very big, soft computer mouse","the cutest peripheral ever",10,39.90';
+
+/*
+Übung 25: CSV-Datensätze mit Anführungszeichen
+Bisher haben wir die Felder in einem CSV-Datensatz einfach mit der Anweisung:
+
+
+record.split(',')
+
+
+in einzelne Felder zerlegt. In der Praxis kann es aber vorkommen, dass ein einzelnes Feld ein Komma enthält. Das Problem wird üblicherweise gelöst, indem die einzelnen Felder noch mit Anführungszeichen umgeben werden. Hier ist ein Beispiel:
+
+'very big, soft computer mouse', 'the cutest peripheral ever', '10', '39.90'
+
+
+Das erste Feld enthält ein Komma (very big, soft computer mouse), trotzdem ist die Unterteilung eindeutig. Schreibe ein kurzes Programm, das diesen Datensatz korrekt zerlegt und die einzelnen Felder ausgibt:
+
+
+const quotedCSV =
+    '"very big, soft computer mouse","the cutest peripheral ever","10","39.90"'
+*/
+
+/*
+Übung 26: CSV-Datensätze mit Anführungszeichen — Teil 2
+In der Praxis finden sich auch CSV-Datensätze, in denen manche Felder mit Anführungszeichen umgeben sind und manche nicht.
+
+Schreibe ein Programm, das auch mit diesen Fällen zurechtkommt. Folgender Datensatz soll korrekt zerlegt werden:
+
+const mixedCSV =
+    '"very big, soft computer mouse","the cutest peripheral ever",10,39.90'
+
+*/
@@ -0,0 +1,51 @@
+# Regex Beispiel
+
+Am besten löst man das mit einem regulären Ausdruck, der entweder nach **Inhalten in Anführungszeichen** sucht _oder_ nach **Inhalten ohne Kommas**.
+
+Hier ist der passende Reguläre Ausdruck:
+
+`/"([^"\\]*(?:\\.[^"\\]*)*)"|([^,]+)/g`
+
+---
+
+### Wie der Regex funktioniert
+
+Der Ausdruck nutzt das **ODER-Prinzip (`|`)**, um zwei Szenarien zu matchen:
+
+1. **`"([^"\\]*(?:\\.[^"\\]*)*)"` (Gruppe 1):** Matcht alles, was in doppelten Anführungszeichen steht. Er erlaubt sogar escaped Anführungszeichen (`\"`) im Text.
+2. **`([^,]+)` (Gruppe 2):** Wenn keine Anführungszeichen da sind, matcht er alles bis zum nächsten Komma.
+
+---
+
+### Anwendung in JavaScript (Beispiel)
+
+Da du das Ergebnis sicherlich in einem Array von einzelnen Werten brauchst, kannst du den Regex wie folgt anwenden. Hierbei nutzen wir `matchAll`, um die Treffer sauber zu trennen und die Anführungszeichen direkt zu entfernen:
+
+```javascript
+const input = '"very big, soft computer mouse","the cutest peripheral ever",10,39.90';
+const regex = /"([^"\\]*(?:\\.[^"\\]*)*)"|([^,]+)/g;
+
+const matches = [...input.matchAll(regex)];
+
+const result = matches.map((match) => {
+  // Wenn Gruppe 1 existiert, war es ein String in Anführungszeichen
+  // Wenn Gruppe 2 existiert, war es ein unberührter Wert (Zahl)
+  const value = match[1] !== undefined ? match[1] : match[2].trim();
+
+  // Optional: Datentypen konvertieren
+  if (!isNaN(value) && value !== '') {
+    return Number(value);
+  }
+  return value;
+});
+
+console.log(result);
+```
+
+### Das Ergebnis (Output)
+
+Nach dem Parsen erhältst du ein sauberes Array, bei dem die Kommas innerhalb der Strings ignoriert wurden und die Zahlen einsatzbereit sind:
+
+```json
+["very big, soft computer mouse", "the cutest peripheral ever", 10, 39.9]
+```
@@ -0,0 +1 @@
+"very big, soft computer mouse","the cutest peripheral ever",10,39.90
@@ -0,0 +1,11 @@
+Code,Short Description,Tagline,Quantity,Price
+MUG0007,coffee mug with LCD level indicator,never again reach for the empty mug,20,49.90
+MUG0013,coffee mug with bluetooth-connected coffee grounds scanner for automatized fortune telling,put the smart into coffee reading,20,99.90
+OFF3145,pen with pre-warmed ink (tested on the South Pole),the pen is mightier than the cold,50,29.90
+COM1001,ambidextrous computer mouse,end the dictate of left and right,10,19.90
+COM0404,Easter egg themed webcam for your monitor,put an Easter egg on hardware too,20,149.90
+COM0001,Vulcan language vi cheatsheet,learn vi and Vulcan at the same time,3,9.90
+COM1536,Klingon language emacs cheatsheet,learn emacs and Klingon at the same time,50,9.90
+MOB0555,smartphone case with built-in screen,never miss a message,20,39.90
+
+
@@ -0,0 +1,13 @@
+import fs from 'node:fs';
+import zlib from 'node:zlib';
+import color from 'chalk';
+
+const data = fs.readFileSync('data/products.csv', 'utf-8');
+
+const convertCsvToJson = (products, ar) => {};
+
+/*
+Übung 27: Ohne Umwege
+
+Die Datei products.csv soll in eine products.json umgewandelt werden und in products.json.gz komprimiert werden.
+*/
@@ -0,0 +1,16 @@
+{
+  "name": "u27_zlib",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "module",
+  "dependencies": {
+    "chalk": "^6.0.1"
+  }
+}
@@ -0,0 +1,20 @@
+// const crypto = require('node:crypto');
+import crypto from 'node:crypto';
+
+const PASSWORD_LENGTH = 10;
+const s = '23456789abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ!.,;#$%/+*';
+
+const buf = crypto.randomBytes(PASSWORD_LENGTH);
+const password = Array.from(buf)
+  .map((byte) => s.charAt(byte % s.length))
+  .join('');
+
+console.log(password);
+
+// Übung 28: Passwortgenerator
+
+// Was macht der folgende Code?
+
+// OK: Der Titel verrät es schon. Versuche dennoch, das Programm zu verstehen! Benutze die Dokumentation der Standardbibliothek, um nachzuschlagen, was crypto.randomBytes(…) genau macht!
+
+// Bonusfrage: Warum sind in den Zeichen «1», «i» und «l» nicht enthalten, genau so wenig wie «0» und «o»?
@@ -0,0 +1,21 @@
+{
+  "name": "u28_password-generator",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "u28_password-generator",
+      "version": "1.0.0",
+      "dependencies": {
+        "lodash": "^4.18.1"
+      }
+    },
+    "node_modules/lodash": {
+      "version": "4.18.1",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.18.1.tgz",
+      "integrity": "sha512-dMInicTPVE8d1e5otfwmmjlxkZoUpiVLwyeTdUsi/Caj/gfzzblBcCE5sRHV/AsjuCmxWrte2TNGSYuCeCq+0Q==",
+      "license": "MIT"
+    }
+  }
+}
@@ -0,0 +1,14 @@
+{
+  "name": "u28_password-generator",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "type": "module",
+  "dependencies": {
+    "lodash": "^4.18.1"
+  }
+}
@@ -0,0 +1,23 @@
+// const fs = require('node:fs');
+// const zlib = require('node:zlib');
+import fs from 'node:fs';
+import zlib from 'node:zlib';
+
+const gzipCompressor = zlib.createGzip();
+
+const inputStream = fs.createReadStream('data/products.html');
+const outputStream = fs.createWriteStream('data/products.html.gz');
+
+inputStream.on('data', (data) => {
+  console.log('Pakete (data chunks) werden geladen: ', data.length);
+  outputStream.write(zlib.gzipSync(data));
+});
+
+inputStream.pipe(gzipCompressor).pipe(outputStream);
+
+// Übung 29: Datenströme
+// Schreibe Codebeispiel 239 um, ohne die Funktion pipe(…) zu verwenden!
+
+// TIPP: Um eine Datei päckchenweise lesen- und schreiben zu können, gibt es für das fs Modul die Methoden createReadStream und createWriteStream.
+
+// ÜBUNG BEREITS GELÖST!!!
@@ -0,0 +1,13 @@
+{
+  "name": "03_stream",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "module"
+}
@@ -0,0 +1,12 @@
+// Übung 32: Information zum Betriebssystem und der Anzahl der vorhandenen CPUs
+
+// Im Kontext einer Monitoring-Lösung benötigt ein Kunde eine kleine CLI (Command Line Interface)-Anwendung, die es erlaubt, das aktuelle Betriebssystem und die Anzahl der CPUs auf dem jeweiligen Rechner zu ermitteln.
+
+// Vorgehensweise
+
+// 1.Schau dir die Online-Dokumentation zum os-Modul der Standardbibliothek an.
+// 2.Erstelle dann ein kurzes Node.js-Programm, das ausgibt, auf welcher Plattform es gerade läuft (also etwa »linux«, »darwin« (OS X) oder »win32«) und wie viele Kerne der Rechner hat.
+
+// Hier eine mögliche Beispielausgabe:
+
+// I am running on a machine with linux and 2 cores.
@@ -0,0 +1,11 @@
+{
+  "name": "u32_os-info",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "type": "module"
+}
@@ -10,6 +10,7 @@ const outputStream = fs.createWriteStream('data/products.html.gz');

 inputStream.on('data', (data) => {
  console.log('Pakete (data chunks) werden geladen:', data.length);
+  // outputStream.write(zlib.gzipSync(data)) // ohne pipe-Methode - Datenchunks geschrieben
 });

 inputStream.pipe(gzipCompressor).pipe(outputStream);
@@ -0,0 +1,10 @@
+const fs = require('node:fs'); // commonjs
+
+if (true) {
+  // in code Blöcken ({..}) kann require (commonjs) verwendet werden.
+  const dns = require('node:dns');
+  dns.lookup('www.google.de', 4, (err, data) => {
+    if (err) console.log(err);
+    console.log(data); // => 142.251.208.227
+  });
+}
@@ -0,0 +1,13 @@
+import fs from 'node:fs'; // module - esm Schreibweise
+
+if (true) {
+  // import STATEMENT kann NICHT in Konditionen oder Code-Blöcken ({}) verwendet werden.
+  // import dns from 'node:dns'; // An import declaration can only be used at the top level of a module.
+  // seit 2020 import "dynamic" Funktion innerhalb von Code-Blöcken ({}) verwendet werden.
+  import('node:dns').then((dns) => {
+    dns.lookup('www.google.de', 4, (err, data) => {
+      if (err) console.log(err);
+      console.log(data); // => 142.251.208.227
+    });
+  });
+}
@@ -0,0 +1,902 @@
+{
+  "name": "08_npm-befehle",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "08_npm-befehle",
+      "version": "1.0.0",
+      "dependencies": {
+        "chalk": "^6.0.1",
+        "express": "^5.2.1"
+      }
+    },
+    "node_modules/accepts": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-2.0.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "mime-types": "^3.0.0",
+        "negotiator": "^1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
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+    },
+    "node_modules/body-parser": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.3.0.tgz",
+      "integrity": "sha512-2cGmJupaNgg+QUwVLAucDuWuoMZ6EX9iHDRswZ5lsNYEmwPaRknMPCLZz07yTzVq/83p4o/wzbDZbBrTvGGTIw==",
+      "license": "MIT",
+      "dependencies": {
+        "bytes": "^3.1.2",
+        "content-type": "^2.0.0",
+        "debug": "^4.4.3",
+        "http-errors": "^2.0.1",
+        "iconv-lite": "^0.7.2",
+        "on-finished": "^2.4.1",
+        "qs": "^6.15.2",
+        "raw-body": "^3.0.2",
+        "type-is": "^2.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/body-parser/node_modules/content-type": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-2.1.0.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
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+      "version": "3.1.2",
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+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
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+      "license": "MIT",
+      "dependencies": {
+        "es-errors": "^1.3.0",
+        "function-bind": "^1.1.2"
+      },
+      "engines": {
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+    },
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+      "license": "MIT",
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+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
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+      "license": "MIT",
+      "engines": {
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+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
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+      },
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+        "type": "opencollective",
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+}
@@ -0,0 +1,15 @@
+{
+  "name": "08_npm-befehle",
+  "version": "1.0.0",
+  "description": "",
+  "main": "server.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "type": "commonjs",
+  "dependencies": {
+    "chalk": "^6.0.1",
+    "express": "^5.2.1"
+  }
+}
				`@@ -0,0 +1 @@`
				`"very big, soft computer mouse","the cutest peripheral ever",10,39.90`