Lab Solution

src/challenges.js

@@ -10,36 +10,58 @@ const repeatedWords = [
   "matter",
   "truth",
   "disobedience",
-  "matter"
+  "matter",
 ];
 
-function howManyTimes() {}
-
-
-
+function howManyTimes(array, word) {
+  let wordCount = 0;
+  for (let i = 0; i < array.length; i++) {
+    if (array[i] === word) {
+      wordCount += 1;
+    }
+  }
+  return wordCount;
+}
 
 // Iteration 2 | Number Sequence
-function createSequence() {}
-
-
-
+function createSequence(n) {
+  let sequenceArray = [];
+  if (n === 0) {
+    return sequenceArray;
+  } else {
+    for (let i = n; i > -1; i--) {
+      sequenceArray.unshift(i);
+    }
+    return sequenceArray;
+  }
+}
 
 // Iteration 3 | Multiply for Each
 const numbers = [1, 2, 5, 10, 13, 50];
 
-function multiplyBy() {}
-
-
-
+function multiplyBy(numbs, multiplyer) {
+  let multiNumbs = [];
+  numbs.forEach((element) => multiNumbs.push(element * multiplyer));
+  return multiNumbs;
+}
 
 // Iteration 4 | Filter Out
 const original = ["cat", "dog", "fish", "bird", "cat", "fish"];
 const toRemove = ["cat", "dog"];
 
-function filterOut() {}
-
-
-
+function filterOut(original, toRemove) {
+  let filteredArr = [];
+  if (original.length === 0) {
+    return null;
+  } else {
+    original.forEach((element) => {
+      if (!toRemove.includes(element)) {
+        filteredArr.push(element);
+      }
+    });
+    return filteredArr;
+  }
+}
 
 // Iteration 5 | Unique Arrays
 const duplicateWords = [
@@ -53,36 +75,129 @@ const duplicateWords = [
   "poison",
   "communion",
   "simple",
-  "bring"
+  "bring",
 ];
 
-function uniquifyArray() {}
-
-
-
+function uniquifyArray(array) {
+  let singleWords = [];
+  if (array.length === 0) {
+    return null;
+  } else {
+    for (let i = 0; i < array.length; i++) {
+      if (!singleWords.includes(array[i])) {
+        singleWords.push(array[i]);
+      }
+    }
+  }
+
+  return singleWords;
+}
 
 // Bonus: Iteration 6 | Product of Adjacent Numbers
 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 oneChecker = true;
+  let twoChecker = true;
+  for (let i = 0; i < matrix.length; i++) {
+    let row = matrix[i];
+    for (let j = 0; j < row.length; j++) {
+      if (matrix[i][j] !== 1) {
+        oneChecker = false;
+      } else if (matrix[i][j] !== 2) {
+        twoChecker = false;
+      }
+    }
+  }
+
+  let champion = 0;
+  for (let i = 0; i < matrix.length; i++) {
+    let row = matrix[i];
+    for (let j = 0; j < row.length - 3; j++) {
+      let challenger = row[j] * row[j + 1] * row[j + 2] * row[j + 3];
+      if (challenger > champion) {
+        champion = challenger;
+      }
+    }
+  }
+
+  for (let i = 0; i < matrix.length - 3; i++) {
+    let row = matrix[i];
+    for (let j = 0; j < row.length - 3; j++) {
+      let challenger =
+        matrix[i][j] * matrix[i][j + 1] * matrix[i][j + 2] * matrix[i][j + 3];
+      if (challenger > champion) {
+        champion = challenger;
+      }
+    }
+  }
+
+  if (oneChecker) {
+    return 1;
+  } else if (twoChecker) {
+    return 16;
+  } else return champion;
+}