02_advanced/uebungen/u12_mehrere-dateien-auslesen/index.js

@@ -1,6 +1,34 @@
-// const getFileBy = (path, encoding = 'utf-8') => {
+import fs from 'node:fs';
 
-// };
+const getFileBy = (path = '', encoding = 'utf-8') => {
+  return new Promise((resolve, reject) => {
+    fs.readFile(path, encoding, (error, data) => {
+      if (error) {
+        reject(error);
+      } else {
+        resolve(data);
+      }
+    });
+  });
+};
+
+Promise.all([
+  getFileBy('./data/file01.txt'),
+  getFileBy('./data/file02.txt'),
+  getFileBy('./data/file03.txt'),
+  // getFileBy('./data/file_03.txt'),
+  getFileBy('./data/file04.txt'),
+  getFileBy('./data/file05.txt'),
+  getFileBy('./data/file06.txt'),
+])
+  .then((data) =>
+    data.forEach((data) => {
+      console.log(data);
+    }),
+  )
+  .catch((error) => {
+    console.log(error);
+  });
 
 /*
 

02_advanced/uebungen/u13_dns-lookup/index.js

@@ -1,24 +1,43 @@
-// TODO: imports
+import dns from 'node:dns';
+import color from 'chalk';
+import util from 'node:util';
 
 const IP_V = 4; // we use IP protocol version 4
 const URL = 'google.de';
 
-// TODO: your modifications
-
 // 1.
-// const getIpBy = () => {};
+const getIpBy = (url, ip = 4) => {
+  return new Promise((resolve, reject) => {
+    dns.lookup(url, ip, (error, data) => {
+      if (error) {
+        reject(error);
+      } else {
+        resolve({ address: data, family: ip });
+      }
+    });
+  });
+};
 
 // 2.
 // Promises Unterobjekt von Node
-// const getPromisesIpBy = () => {};
+const getPromisesIpBy = (url, ip = 4) => {
+  return dns.promises.lookup(url, ip);
+};
 
 // 3.
 // Promisify Helferfunktion
-// const getPromisifyIpBy =
-
+const getPromisifyIpBy = util.promisify(dns.lookup);
 // 4.
 // Async await
-// const getAsyncIpBy =
+const getAsyncIpBy = async (url, ip) => {
+  try {
+    const result = await dns.promises.lookup(url, ip);
+    return result;
+  } catch (err) {
+    console.log(err);
+    throw new Error(err);
+  }
+};
 
 // Test Cases:
 // =============================
@@ -55,23 +74,20 @@ getAsyncIpBy(URL, IP_V)
   });
 
 /* Übung 13: Das Telefonbuch des Internets
-
-Vielleicht hast du einmal die Webseite www.nodejs.com besucht? Dann hat dein Computer die so genannte IP-Adresse des Servers www.nodejs.com herausgefunden.
-
+ 
+Vielleicht hast du einmal die Webseite www.nodejs.com besucht? Dann hat dein Computer die so genannte IP-Adresse des Servers www.nodejs.org herausgefunden.
+ 
 Ähnlich wie ein Telefonbuch ordnet das Domain Name System (DNS) jedem Server (Host) eine eindeutige IP-Adresse zu, unter der er über das Internet erreichbar ist.
-
+ 
 Die Node.js-API bietet eine Funktion, um Namen im DNS nachzuschlagen: dns.lookup(…).
-
+ 
 Die Übung besteht nun darin, obiges Beispiel so umzuschreiben, dass der Aufruf von dns.lookup(…) in eine Wrapper-Funkion verpackt wird.
-
+ 
 Es sollen drei verschiedene Lösungen erstellt werden:
-
+ 
 1. Ausführliche Variante mit eigenem Promise-Objekt als Ummantelung
-
-2. Kurze Variante mit Promises-Unterobjekt (dns.promises)
-
+2. Kurze Variante mit Promises-Unterobjekt (dns.promises) 
 3. Promisify-Variante mit util.promisify(…)
-
 4. Async await Variante
-
+ 
 */

02_advanced/uebungen/u13_dns-lookup/package-lock.json

@@ -0,0 +1,28 @@
+{
+  "name": "u13_dns-lookup",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "u13_dns-lookup",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "chalk": "^6.0.0"
+      }
+    },
+    "node_modules/chalk": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-6.0.0.tgz",
+      "integrity": "sha512-2uNTXIuTTxk7ciZgAU1BQcgnchcG0xXnrs6jzkQfj9SsRa9M2s5zE8WT96hS6KmG4MzWHSrvH43DF1m4XRkrFg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=22"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
+      }
+    }
+  }
+}

02_advanced/uebungen/u14_avg-scores/index.html

@@ -44,6 +44,43 @@
         ['Clara', 76, 95, 89, 91],
         ['David', 82, 79, 91, 85],
       ];
+
+      const calculateAvgGrades = () => {
+        const averages = [];
+
+        for (let row = 1; row < gradesTable.length; row++) {
+          let sum = 0;
+
+          for (let column = 1; column < gradesTable[row].length; column++) {
+            sum += gradesTable[row][column];
+          }
+
+          const numberOfSubjects = gradesTable[row].length - 1;
+          averages.push(Number((sum / numberOfSubjects).toFixed(2)));
+        }
+
+        return averages;
+      };
+
+      const calculateAvgSubjects = () => {
+        const averages = [];
+
+        for (let column = 1; column < gradesTable[0].length; column++) {
+          let sum = 0;
+
+          for (let row = 1; row < gradesTable.length; row++) {
+            sum += gradesTable[row][column];
+          }
+
+          const numberOfStudents = gradesTable.length - 1;
+          averages.push(Number((sum / numberOfStudents).toFixed(2)));
+        }
+
+        return averages;
+      };
+
+      console.log(calculateAvgGrades()); // => [85.75, 85.25, 87.75, 84.25]
+      console.log(calculateAvgSubjects()); // => [83.25, 88.5, 85.5, 85.75]
     </script>
   </body>
 </html>

02_advanced/uebungen/u15_shopping-list/index.html

@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="de">
   <head>
     <meta charset="UTF-8" />
@@ -32,7 +32,24 @@
         ['Dairy', 'Milk', 'Cheese', 'Yogurt'],
       ];
 
-      // Your code here
+      shoppingList[0][2] = 'Grapes'; // Replace 'Bananas' with 'Grapes'
+      shoppingList[1][2] = 'Tomatoes'; // Replace 'Broccoli' with 'Tomatoes'
+      shoppingList[2][2] = 'Butter'; // Replace 'Cheese' with 'Butter'
+
+      // let replaceAr = ['Grapes', 'Tomatoes', 'Butter'];
+
+      // const results = shoppingList.map((list, idx) => {
+      //   return list.toSpliced(2, 1, replaceAr[idx]);
+      // });
+
+      // console.log(results);
+
+      // Expected outcome:
+      // [
+      //     ['Fruits', 'Apples', 'Grapes', 'Oranges'],
+      //     ['Vegetables', 'Carrots', 'Tomatoes', 'Spinach'],
+      //     ['Dairy', 'Milk', 'Butter', 'Yogurt'],
+      // ]
     </script>
   </body>
 </html>

02_advanced/uebungen/u16_geoquiz/index.html

@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="de">
   <head>
     <meta charset="UTF-8" />
@@ -36,7 +36,21 @@
         ['Russia', 'Moscow'],
       ];
 
-      const getCapitalOf = () => {};
+      const getCapitalOf = (country) => {
+        return countriesWithCapital.find((countryWithCapital) => countryWithCapital[0] === country)[1];
+      };
+
+      // const capitalOf = (country) => {
+      //   const capitalIndex = 1;
+      //   const countryIndex = 0;
+      //   return countriesWithCapital.find((countryWithCapital) => countryWithCapital[countryIndex] === country)[
+      //     capitalIndex
+      //   ];
+      // };
+
+      console.log('Switzerland:', getCapitalOf('Switzerland'));
+      console.log('Germany:', getCapitalOf('Germany'));
+      console.log('Russia:', getCapitalOf('Russia'));
     </script>
   </body>
 </html>

02_advanced/uebungen/u17_inventory-modification/index.html

@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="de">
   <head>
     <meta charset="UTF-8" />
@@ -39,7 +39,11 @@
         ],
       ];
 
-      // Your code here
+      // Add the Books category with its products.
+      inventory.push([
+        ['Shelf 1', 'Novels', 40],
+        ['Shelf 2', 'Non-fiction', 35],
+      ]);
 
       console.log(inventory);
       /* Expected outcome:

02_advanced/uebungen/u18_3d-array-selection/index.html

@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="de">
   <head>
     <meta charset="UTF-8" />
@@ -44,7 +44,7 @@
         ],
       ];
 
-      // Your code here
+      inventory[1][1][2] = 25;
 
       console.log(inventory);
       /*

02_advanced/uebungen/u19_brightness-increase/index.html

@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="de">
   <head>
     <meta charset="UTF-8" />
@@ -41,7 +41,13 @@
       ];
 
       const increaseBrightness = (image, value) => {
-        // Your code here
+        return image.map((row) =>
+          //
+          row.map((pixel) =>
+            //
+            pixel.map((idx) => Math.min(idx + value, 255)),
+          ),
+        );
       };
 
       const newImage = increaseBrightness(image, 30);