add solutions for JS Ch. 6

Author: Dusch4593

6-functions/29-greetings.js

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+// Greetings 👋
+// Codédex
+
+function greetings() {
+  for (let i = 1; i <= 3; i++) {
+    console.log(i);
+  }
+  console.log("Hello, everyone!");
+}
+
+greetings();

6-functions/30-blast-off.js

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+// Blast Off 🚀
+// Codédex
+
+function countdown() {
+  const randomNumber = Math.floor(Math.random() * 10) + 1;
+  
+  for (let i = 10; i > 0; i--) {
+    console.log(i);
+  }
+  
+  return "Blast Off! 🚀";
+}
+
+console.log(countdown());

6-functions/31-e-mc-2.js

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+// E = mc² 🌌
+// Codédex
+
+function relativityTheory(mass) {
+  const speedOfLight = 3e8;
+
+  const energy = mass * speedOfLight ** 2;
+
+  return energy
+}
+
+relativityTheory(123.4);

6-functions/32-clout.js

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+// YouTube Stats ▶️
+// Codédex
+
+const weeklyYouTubeStats = [2.3, 4.8, 6.7, 7.0, 1.9, 8.4, 5.2];
+
+function mean() {
+  let totalViews = 0;
+  
+  for (let i = 0; i < weeklyYouTubeStats.length; i++) {
+    totalViews += weeklyYouTubeStats[i];
+  }
+  
+  return totalViews / weeklyYouTubeStats.length;
+}
+
+function median() {
+  const sortedStats = weeklyYouTubeStats.sort();
+  const middleIndex = Math.floor(weeklyYouTubeStats.length / 2);
+  
+  return sortedStats[middleIndex];
+}
+
+console.log(mean());
+console.log(median());

6-functions/33-palindrome.js

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+// Palindrome ↔️
+// Codédex
+
+function isPalindrome(word) {
+  let reversedWord = "";
+  
+  let lowerCaseWord = word.toLowerCase();
+  
+  for (let i = lowerCaseWord.length - 1; i >= 0; i--) {
+    reversedWord += lowerCaseWord[i];
+  }
+  
+  return reversedWord == lowerCaseWord;
+}
+
+console.log(isPalindrome("Racecar"));