HomeWork Iteration

Author: katywolk

Exercises/1-for.js

@@ -1,9 +1,12 @@
 'use strict';
 
 const sum = (...args) => {
-  // Use for loop and accumulator variable
-  // to calculate sum of all given arguments
-  // For example sum(1, 2, 3) should return 6
+  let total = 0;
+
+  for (let i = 0; i < args.length; i++) {
+    total += args[i];
+  }
+  return total;
 };
 
 module.exports = { sum };

Exercises/2-for-of.js

@@ -1,9 +1,11 @@
 'use strict';
 
 const sum = (...args) => {
-  // Use for..of loop and accumulator variable
-  // to calculate sum of all given arguments
-  // For example sum(1, 2, 3) should return 6
+  let total = 0;
+  for (const number of args) {
+    total += number;
+  }
+  return total;
 };
 
 module.exports = { sum };

Exercises/3-while.js

@@ -1,9 +1,13 @@
 'use strict';
 
 const sum = (...args) => {
-  // Use while loop and accumulator variable
-  // to calculate sum of all given arguments
-  // For example sum(1, 2, 3) should return 6
+  let total = 0;
+  let i = 0;
+  while (i < args.length) {
+    total += args[i];
+    i++;
+  }
+  return total;
 };
 
 module.exports = { sum };

Exercises/4-do-while.js

@@ -1,9 +1,14 @@
 'use strict';
 
 const sum = (...args) => {
-  // Use do..while loop and accumulator variable
-  // to calculate sum of all given arguments
-  // For example sum(1, 2, 3) should return 6
+  let total = 0;
+  let i = 0;
+
+  do {
+    total += args[i] || 0;
+    i++;
+  } while (i < args.length);
+  return total;
 };
 
 module.exports = { sum };

Exercises/5-reduce.js

@@ -1,8 +1,5 @@
 'use strict';
 
-const sum = (...args) => 0;
-// Use Array.prototype.reduce method
-// to calculate sum of all given arguments
-// For example sum(1, 2, 3) should return 6
+const sum = (...args) => args.reduce((acc, num) => acc + num, 0);
 
 module.exports = { sum };

Exercises/6-matrix.js

@@ -1,9 +1,21 @@
 'use strict';
 
 const max = (matrix) => {
-  // Use nested for loop to find max value in 2d matrix
-  // For example max([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
-  // should return 9
+  let maxValue = -Infinity;
+
+  const findMax = (arr) => {
+    for (const el of arr) {
+      if (Array.isArray(el)) {
+        findMax(el);
+      } else {
+        maxValue = Math.max(maxValue, el);
+      }
+    }
+  };
+
+  findMax(matrix);
+  return maxValue;
 };
 
+
 module.exports = { max };

Exercises/7-ages.js

@@ -1,19 +1,11 @@
 'use strict';
 
 const ages = (persons) => {
-  // Use for..in to calculate age for each person
-  // For example ages({
-  //   lenin: { born: 1870, died: 1924 },
-  //   mao: { born: 1893, died: 1976 },
-  //   gandhi: { born: 1869, died: 1948 },
-  //   hirohito: { born: 1901, died: 1989 },
-  // })
-  // should return {
-  //   lenin: 54,
-  //   mao: 83,
-  //   gandhi: 79,
-  //   hirohito: 88,
-  // }
+  const result = {};
+  for (const person in persons) {
+    result[person] = persons[person].died - persons[person].born;
+  }
+  return result;
 };
 
 module.exports = { ages };