diff --git a/src/functions-and-arrays.js b/src/functions-and-arrays.js
index 3a7dbec41..3603b2106 100644
--- a/src/functions-and-arrays.js
+++ b/src/functions-and-arrays.js
@@ -1,119 +1,260 @@
 // Iteration #1: Find the maximum
-function maxOfTwoNumbers() {}
-
-
+function maxOfTwoNumbers(num1, num2) {
+  return num1 > num2 ? num1 : num2;
+}
 
 // Iteration #2: Find longest word
-const words = ['mystery', 'brother', 'aviator', 'crocodile', 'pearl', 'orchard', 'crackpot'];
-
-function findLongestWord() {}
-
+const words = [
+  "mystery",
+  "brother",
+  "aviator",
+  "crocodile",
+  "pearl",
+  "orchard",
+  "crackpot",
+];
 
+function findLongestWord(wordsArray) {
+  if (wordsArray.length === 0) return null;
+  let longestWord = wordsArray[0];
+  for (let word of wordsArray) {
+    if (word.length > longestWord.length) {
+      longestWord = word;
+    }
+  }
+  return longestWord;
+}
+console.log(`The longest word is: ${findLongestWord(words)}`);
 
 // Iteration #3: Calculate the sum
 const numbers = [6, 12, 1, 18, 13, 16, 2, 1, 8, 10];
 
-function sumNumbers() {}
-
-
+function sumNumbers(numbersArray) {
+  let sum = 0;
+  for (let num of numbersArray) {
+    sum += num;
+  }
+  return sum;
+}
+console.log(`Sum of numbers: ${sumNumbers(numbers)}`);
 
 // Iteration #3.1 Bonus:
-function sum() {}
-
-
+function sum(mixedArray) {
+  let total = 0;
+  for (let item of mixedArray) {
+    if (typeof item === "number") {
+      total += item;
+    } else if (typeof item === "string") {
+      total += item.length;
+    } else if (typeof item === "boolean") {
+      total += item ? 1 : 0;
+    } else {
+      throw new Error("Unsupported data type in array");
+    }
+  }
+  return total;
+}
+console.log(`Sum of mixed array: ${sum(mixedArr)}`);
 
 // Iteration #4: Calculate the average
 // Level 1: Array of numbers
 const numbersAvg = [2, 6, 9, 10, 7, 4, 1, 9];
 
-function averageNumbers() {}
-
+function averageNumbers(numbersArray) {
+  if (numbersArray.length === 0) return null;
+  return sumNumbers(numbersArray) / numbersArray.length;
+}
+console.log(`Average of numbers: ${averageNumbers(numbersAvg)}`);
 
 // Level 2: Array of strings
-const wordsArr = ['seat', 'correspond', 'linen', 'motif', 'hole', 'smell', 'smart', 'chaos', 'fuel', 'palace'];
+const wordsArr = [
+  "seat",
+  "correspond",
+  "linen",
+  "motif",
+  "hole",
+  "smell",
+  "smart",
+  "chaos",
+  "fuel",
+  "palace",
+];
 
-function averageWordLength() { }
+function averageWordLength(wordsArray) {
+  if (wordsArray.length === 0) return null;
+  let totalLength = 0;
+  for (let word of wordsArray) {
+    totalLength += word.length;
+  }
+  return totalLength / wordsArray.length;
+}
+console.log(`Average word length: ${averageWordLength(wordsAvg)}`);
 
 // Bonus - Iteration #4.1
-function avg() {}
+function avg(arr) {
+  if (arr.length === 0) return null;
+  let total = 0;
+  for (let item of arr) {
+    if (typeof item === "number") {
+      total += item;
+    } else if (typeof item === "string") {
+      total += item.length;
+    } else if (typeof item === "boolean") {
+      total += item ? 1 : 0;
+    } else {
+      throw new Error("Unsupported data type in array");
+    }
+  }
+  return total / arr.length;
+}
 
 // Iteration #5: Unique arrays
 const wordsUnique = [
-  'crab',
-  'poison',
-  'contagious',
-  'simple',
-  'bring',
-  'sharp',
-  'playground',
-  'poison',
-  'communion',
-  'simple',
-  'bring'
+  "crab",
+  "poison",
+  "contagious",
+  "simple",
+  "bring",
+  "sharp",
+  "playground",
+  "poison",
+  "communion",
+  "simple",
+  "bring",
 ];
 
-function uniquifyArray() {}
-
-
+function uniquifyArray(wordsArray) {
+  if (wordsArray.length === 0) return null;
+  return wordsArray.filter((word, index) => wordsArray.indexOf(word) === index);
+}
+console.log(`Unique array: ${uniquifyArray(wordsUnique)}`);
 
 // Iteration #6: Find elements
-const wordsFind = ['machine', 'subset', 'trouble', 'starting', 'matter', 'eating', 'truth', 'disobedience'];
-
-function doesWordExist() {}
-
+const wordsFind = [
+  "machine",
+  "subset",
+  "trouble",
+  "starting",
+  "matter",
+  "eating",
+  "truth",
+  "disobedience",
+];
 
+function doesWordExist(wordsArray, word) {
+  if (wordsArray.length === 0) return null;
+  return wordsArray.includes(word);
+}
 
 // Iteration #7: Count repetition
 const wordsCount = [
-  'machine',
-  'matter',
-  'subset',
-  'trouble',
-  'starting',
-  'matter',
-  'eating',
-  'matter',
-  'truth',
-  'disobedience',
-  'matter'
+  "machine",
+  "matter",
+  "subset",
+  "trouble",
+  "starting",
+  "matter",
+  "eating",
+  "matter",
+  "truth",
+  "disobedience",
+  "matter",
 ];
 
-function howManyTimes() {}
-
-
+function howManyTimes(wordsArray, word) {
+  return wordsArray.filter((item) => item === word).length;
+}
 
 // Iteration #8: Bonus
 const matrix = [
   [8, 2, 22, 97, 38, 15, 0, 40, 0, 75, 4, 5, 7, 78, 52, 12, 50, 77, 91, 8],
-  [49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 4, 56, 62, 0],
-  [81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 3, 49, 13, 36, 65],
+  [
+    49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 4, 56, 62,
+    0,
+  ],
+  [
+    81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 3, 49, 13, 36,
+    65,
+  ],
   [52, 70, 95, 23, 4, 60, 11, 42, 69, 24, 68, 56, 1, 32, 56, 71, 37, 2, 36, 91],
-  [22, 31, 16, 71, 51, 67, 63, 89, 41, 92, 36, 54, 22, 40, 40, 28, 66, 33, 13, 80],
-  [24, 47, 32, 60, 99, 3, 45, 2, 44, 75, 33, 53, 78, 36, 84, 20, 35, 17, 12, 50],
-  [32, 98, 81, 28, 64, 23, 67, 10, 26, 38, 40, 67, 59, 54, 70, 66, 18, 38, 64, 70],
-  [67, 26, 20, 68, 2, 62, 12, 20, 95, 63, 94, 39, 63, 8, 40, 91, 66, 49, 94, 21],
-  [24, 55, 58, 5, 66, 73, 99, 26, 97, 17, 78, 78, 96, 83, 14, 88, 34, 89, 63, 72],
+  [
+    22, 31, 16, 71, 51, 67, 63, 89, 41, 92, 36, 54, 22, 40, 40, 28, 66, 33, 13,
+    80,
+  ],
+  [
+    24, 47, 32, 60, 99, 3, 45, 2, 44, 75, 33, 53, 78, 36, 84, 20, 35, 17, 12,
+    50,
+  ],
+  [
+    32, 98, 81, 28, 64, 23, 67, 10, 26, 38, 40, 67, 59, 54, 70, 66, 18, 38, 64,
+    70,
+  ],
+  [
+    67, 26, 20, 68, 2, 62, 12, 20, 95, 63, 94, 39, 63, 8, 40, 91, 66, 49, 94,
+    21,
+  ],
+  [
+    24, 55, 58, 5, 66, 73, 99, 26, 97, 17, 78, 78, 96, 83, 14, 88, 34, 89, 63,
+    72,
+  ],
   [21, 36, 23, 9, 75, 0, 76, 44, 20, 45, 35, 14, 0, 61, 33, 97, 34, 31, 33, 95],
   [78, 17, 53, 28, 22, 75, 31, 67, 15, 94, 3, 80, 4, 62, 16, 14, 9, 53, 56, 92],
-  [16, 39, 5, 42, 96, 35, 31, 47, 55, 58, 88, 24, 0, 17, 54, 24, 36, 29, 85, 57],
+  [
+    16, 39, 5, 42, 96, 35, 31, 47, 55, 58, 88, 24, 0, 17, 54, 24, 36, 29, 85,
+    57,
+  ],
   [86, 56, 0, 48, 35, 71, 89, 7, 5, 44, 44, 37, 44, 60, 21, 58, 51, 54, 17, 58],
-  [19, 80, 81, 68, 5, 94, 47, 69, 28, 73, 92, 13, 86, 52, 17, 77, 4, 89, 55, 40],
+  [
+    19, 80, 81, 68, 5, 94, 47, 69, 28, 73, 92, 13, 86, 52, 17, 77, 4, 89, 55,
+    40,
+  ],
   [4, 52, 8, 83, 97, 35, 99, 16, 7, 97, 57, 32, 16, 26, 26, 79, 33, 27, 98, 66],
-  [88, 36, 68, 87, 57, 62, 20, 72, 3, 46, 33, 67, 46, 55, 12, 32, 63, 93, 53, 69],
-  [4, 42, 16, 73, 38, 25, 39, 11, 24, 94, 72, 18, 8, 46, 29, 32, 40, 62, 76, 36],
-  [20, 69, 36, 41, 72, 30, 23, 88, 34, 62, 99, 69, 82, 67, 59, 85, 74, 4, 36, 16],
-  [20, 73, 35, 29, 78, 31, 90, 1, 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 5, 54],
-  [1, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 1, 89, 19, 67, 48]
+  [
+    88, 36, 68, 87, 57, 62, 20, 72, 3, 46, 33, 67, 46, 55, 12, 32, 63, 93, 53,
+    69,
+  ],
+  [
+    4, 42, 16, 73, 38, 25, 39, 11, 24, 94, 72, 18, 8, 46, 29, 32, 40, 62, 76,
+    36,
+  ],
+  [
+    20, 69, 36, 41, 72, 30, 23, 88, 34, 62, 99, 69, 82, 67, 59, 85, 74, 4, 36,
+    16,
+  ],
+  [
+    20, 73, 35, 29, 78, 31, 90, 1, 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 5,
+    54,
+  ],
+  [
+    1, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 1, 89, 19, 67,
+    48,
+  ],
 ];
 
-function greatestProduct() {}
-
-
+function greatestProduct(matrix) {
+  let maxProduct = 0;
+  for (let i = 0; i < matrix.length; i++) {
+    for (let j = 0; j < matrix[i].length - 3; j++) {
+      const horizontal =
+        matrix[i][j] * matrix[i][j + 1] * matrix[i][j + 2] * matrix[i][j + 3];
+      if (horizontal > maxProduct) maxProduct = horizontal;
+    }
+  }
+  for (let i = 0; i < matrix.length - 3; i++) {
+    for (let j = 0; j < matrix[i].length; j++) {
+      const vertical =
+        matrix[i][j] * matrix[i + 1][j] * matrix[i + 2][j] * matrix[i + 3][j];
+      if (vertical > maxProduct) maxProduct = vertical;
+    }
+  }
+  return maxProduct;
+}
 
+console.log(`Greatest product: ${greatestProduct(matrix)}`);
 
 // The following is required to make unit tests work.
 /* Environment setup. Do not modify the below code. */
-if (typeof module !== 'undefined') {
+if (typeof module !== "undefined") {
   module.exports = {
     maxOfTwoNumbers,
     findLongestWord,
@@ -125,6 +266,6 @@ if (typeof module !== 'undefined') {
     uniquifyArray,
     doesWordExist,
     howManyTimes,
-    greatestProduct
+    greatestProduct,
   };
 }