Solved lab

src/functions-and-arrays.js

@@ -1,41 +1,111 @@
 // Iteration #1: Find the maximum
-function maxOfTwoNumbers() {}
-
-
+function maxOfTwoNumbers(a, b) {
+  if (a > b){
+    return a
+  }
+  return b
+}
 
 // Iteration #2: Find longest word
 const words = ['mystery', 'brother', 'aviator', 'crocodile', 'pearl', 'orchard', 'crackpot'];
 
-function findLongestWord() {}
+function findLongestWord(words) {
+  let longest = ''
+  if (words.length === 0){
+    return null
+  }
+  for (let i = 0; i < words.length; i++){
+    if (words[i].length > longest.length){
+      longest = words[i]
+    }
+  }
+  return longest
+}
 
 
 
 // Iteration #3: Calculate the sum
 const numbers = [6, 12, 1, 18, 13, 16, 2, 1, 8, 10];
 
-function sumNumbers() {}
+function sumNumbers(numbers) {
+  let sum = 0
+  for (let i = 0; i < numbers.length; i++){
+    sum += numbers[i]
+  }
+  return sum
+}
 
 
 
 // Iteration #3.1 Bonus:
-function sum() {}
-
+const mixedArr = [6, 12, 'miami', 1, true, 'barca', '200', 'lisboa', 8, 10];
+
+function sum(mixedArr) {
+  let sum = 0;
+  for (let i = 0; i < mixedArr.length; i++){
+    if (typeof mixedArr[i] === 'number' || typeof mixedArr[i] === 'boolean'){
+      sum += mixedArr[i]
+    } else if (typeof mixedArr[i] === 'string'){
+      sum += mixedArr[i].length
+    } else if (typeof mixedArr[i] === 'object') {
+      throw new Error("Unsupported data type sir or ma'am")
+    }
+  }
+
+  return sum
+}
 
 
 // Iteration #4: Calculate the average
 // Level 1: Array of numbers
 const numbersAvg = [2, 6, 9, 10, 7, 4, 1, 9];
 
-function averageNumbers() {}
+function averageNumbers(numbersAvg) {
+  if (numbersAvg.length === 0) {
+    return null
+  }
+
+  let sum = 0;
+  for (let i = 0; i < numbersAvg.length; i++){
+    sum += numbersAvg[i]
+  }
+  return sum/numbersAvg.length
+}
 
 
 // Level 2: Array of strings
 const wordsArr = ['seat', 'correspond', 'linen', 'motif', 'hole', 'smell', 'smart', 'chaos', 'fuel', 'palace'];
 
-function averageWordLength() { }
+function averageWordLength(wordsArr) {
+  if (wordsArr.length === 0){
+    return null
+  }
+
+  let sum = 0;
+  for (let i = 0; i < wordsArr.length; i++){
+    sum += wordsArr[i].length
+  }
+  return sum/wordsArr.length
+}
 
 // Bonus - Iteration #4.1
-function avg() {}
+function avg(arr) {
+  if (arr.length === 0){
+    return null
+  }
+
+  let sum = 0;
+  for (let i = 0; i < arr.length; i++){
+    if (typeof arr[i] === 'object'){
+      throw new Error('error')
+    } else if (typeof arr[i] === 'string'){
+      sum += arr[i].length
+    } else {
+      sum += arr[i]
+    }
+  }
+  return sum/arr.length
+}
 
 // Iteration #5: Unique arrays
 const wordsUnique = [
@@ -52,14 +122,31 @@ const wordsUnique = [
   'bring'
 ];
 
-function uniquifyArray() {}
-
+function uniquifyArray(wordsUnique) {
+  let unique = []
+  if (wordsUnique.length === 0){
+    return null
+  }
+  for (let i = 0; i < wordsUnique.length; i++){
+    if (!unique.includes(wordsUnique[i])){
+      unique.push(wordsUnique[i])
+    }
+  }
+  return unique
+}
 
 
 // Iteration #6: Find elements
 const wordsFind = ['machine', 'subset', 'trouble', 'starting', 'matter', 'eating', 'truth', 'disobedience'];
 
-function doesWordExist() {}
+function doesWordExist(wordsFind, word) {
+  if (wordsFind.length === 0){
+    return null
+  } else if (wordsFind.includes(word)){
+    return true
+  }
+  return false
+}
 
 
 
@@ -78,7 +165,17 @@ const wordsCount = [
   'matter'
 ];
 
-function howManyTimes() {}
+function howManyTimes(wordsCount, word) {
+  let count = 0
+
+  for (let i = 0; i < wordsCount.length; i++){
+    if (wordsCount[i] === word){
+      count++
+    }
+  }
+
+  return count
+}
 
 
 
@@ -106,7 +203,22 @@ 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 greatestProduct = 0
+  for (let i = 0; i < (matrix.length - 3); i++) {
+    for (let j = 0; j < (matrix[i].length - 3);j++){
+      let horizontalProduct = (matrix[i][j]*matrix[i][j+1]*matrix[i][j+2]*matrix[i][j+3])
+      let verticalProduct = (matrix[i][j]*matrix[i+1][j]*matrix[i+2][j]*matrix[i+3][j])
+      if (horizontalProduct > greatestProduct){
+        greatestProduct = horizontalProduct
+      } else if (verticalProduct > greatestProduct){
+        greatestProduct = verticalProduct
+      }
+    }
+  }
+
+  return greatestProduct
+}