Solved lab

src/functions-and-arrays.js

@@ -1,41 +1,111 @@
 // Iteration #1: Find the maximum
-function maxOfTwoNumbers() {}
-
+function maxOfTwoNumbers(num1, num2) {
+  if (num1 > num2) {
+    return num1;
+  } else {
+    return num2;
+  }
+}
 
+console.log(maxOfTwoNumbers(5, 10));
 
 // Iteration #2: Find longest word
 const words = ['mystery', 'brother', 'aviator', 'crocodile', 'pearl', 'orchard', 'crackpot'];
 
-function findLongestWord() {}
-
+function findLongestWord(arr) {
+  if (arr.length === 0) return null;
+  let longestWord = '';
+  for (let i = 0; i < arr.length; i++ ) {
+    if (arr[i].length > longestWord.length) {
+      longestWord = arr[i];
+    }
+  }
+  return longestWord;
+}
 
+console.log(findLongestWord(words));
 
 // Iteration #3: Calculate the sum
 const numbers = [6, 12, 1, 18, 13, 16, 2, 1, 8, 10];
 
-function sumNumbers() {}
-
+function sumNumbers(arr) {
+  let sum = 0;
+  for (let i = 0; i < arr.length; i++) {
+    sum += arr[i];
+  }
+  return sum;
+}
 
+console.log(sumNumbers(numbers));
 
 // Iteration #3.1 Bonus:
-function sum() {}
-
+const mixedArr = [6, 12, 'miami', 1, true, 'barca', '200', 'lisboa', 8, 10];
+
+function sum(arr) {
+  let sum = 0;
+  for (let i = 0; i < arr.length; i++) {
+    const value = arr[i];
+    if (typeof value === 'object') {
+      throw new Error("Function does not support objects or arrays");
+    } else if (typeof value === 'number') {
+      sum += value;
+    } else if (typeof value === 'string') {
+      const strLength = value.length;
+      sum += strLength;
+    } else if (typeof value === 'boolean') {
+      const num = Number(value);
+      if (!isNaN(num)) {
+        sum += num;
+      }
+    }
+  }
+  return sum;
+}
 
+console.log(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(arr) {
+  if (arr.length === 0) return null;
+  const sum = sumNumbers(arr);
+  return sum / arr.length;
+}
 
+console.log(averageNumbers(numbersAvg));
 
 // Level 2: Array of strings
 const wordsArr = ['seat', 'correspond', 'linen', 'motif', 'hole', 'smell', 'smart', 'chaos', 'fuel', 'palace'];
 
-function averageWordLength() { }
+function averageWordLength(arr) {
+  if (arr.length === 0) return null;
+
+  const totalLength = arr.reduce((acc, word) => acc + word.length, 0);
+  return totalLength / arr.length;
+}
+
+console.log(averageWordLength(wordsArr));
 
 // Bonus - Iteration #4.1
-function avg() {}
+numbers = [2, 6, 9, 10, 7, 4, 1, 9];
+function averageNumbers(arr) {
+  if (arr.length === 0) return null;
+
+  const sum = sumNumbers(arr);
+  return sum / arr.length;
+}
+
+console.log(averageNumbers(numbers));
+
+function avg(arr) {
+  if (arr.length === 0) return null;
+  const totalSum = sum(arr);
+  return totalSum / arr.length;
+}
+
+console.log(avg(mixedArr));
 
 // Iteration #5: Unique arrays
 const wordsUnique = [
@@ -52,16 +122,29 @@ const wordsUnique = [
   'bring'
 ];
 
-function uniquifyArray() {}
-
+function uniquifyArray(arr) {
+  if (!arr || arr.length === 0) return null;
+  const uniqueWords = [];
+  for (let i = 0; i < arr.length; i++) {
+    if (!uniqueWords.includes(arr[i])) {
+      uniqueWords.push(arr[i]);
+    }
+  }
+  return uniqueWords;
+}
 
+console.log(uniquifyArray(wordsUnique));
 
 // Iteration #6: Find elements
 const wordsFind = ['machine', 'subset', 'trouble', 'starting', 'matter', 'eating', 'truth', 'disobedience'];
 
-function doesWordExist() {}
+function doesWordExist(arr, word) {
+  if (!Array.isArray(arr) || arr.length === 0) return null;
 
+  return arr.includes(word);
+}
 
+console.log(doesWordExist(wordsFind, 'machine'));
 
 // Iteration #7: Count repetition
 const wordsCount = [
@@ -78,9 +161,17 @@ const wordsCount = [
   'matter'
 ];
 
-function howManyTimes() {}
+function howManyTimes(arr, word) {
+  if (!Array.isArray(arr) || arr.length === 0) return 0;
 
+  let count = 0;
+  for (let i = 0; i < arr.length; i++) {
+    if (arr[i] === word) count++;
+  }
+  return count;
+}
 
+console.log(howManyTimes(wordsCount, 'matter'));
 
 // Iteration #8: Bonus
 const matrix = [
@@ -106,10 +197,23 @@ const matrix = [
   [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; j++) {
+      if (j + 3 < matrix[i].length) {
+        const horizontalProduct = matrix[i][j] * matrix[i][j + 1] * matrix[i][j + 2] * matrix[i][j + 3];
+        maxProduct = Math.max(maxProduct, horizontalProduct);
+      }
+      if (i + 3 < matrix.length) {
+        const verticalProduct = matrix[i][j] * matrix[i + 1][j] * matrix[i + 2][j] * matrix[i + 3][j];
+        maxProduct = Math.max(maxProduct, verticalProduct);
+      }
+    }
+  }
+  return maxProduct;
+}
 
 // The following is required to make unit tests work.
 /* Environment setup. Do not modify the below code. */