Tasks 1 - 7 NonStudent User

Exercises/1-for.js

@@ -1,9 +1,12 @@
-'use strict';
+/* eslint-disable quotes */
+"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
+const sum = args => {
+  let add = 0;
+  for (let i = 0; i < args.length; i++) {
+    add += Number(args[i]);
+  }
+  return add;
 };
 
 module.exports = { sum };

Exercises/2-for-of.js

@@ -1,9 +1,13 @@
-'use strict';
+/* eslint-disable quotes */
+"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 add = 0;
+  for (const i of args) {
+    add += i;
+  }
+  return add;
 };
 
+
 module.exports = { sum };

Exercises/3-while.js

@@ -1,9 +1,14 @@
 '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 add = 0;
+  let index = args.length - 1;
+  while (index >= 0) {
+    add += args[index];
+    args.pop();
+    index--;
+  }
+  return add;
 };
 
 module.exports = { sum };

Exercises/4-do-while.js

@@ -1,9 +1,14 @@
-'use strict';
+// eslint-disable-next-line quotes
+"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 add = 0;
+  let index = args.length - 1;
+  do {
+    add += args[index];
+    index--;
+  } while (index >= 0);
+  return add;
 };
 
 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, curr) => acc + curr, 0);
 
 module.exports = { sum };

Exercises/6-matrix.js

@@ -1,9 +1,12 @@
 '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
-};
+const max = matrix =>
+  []
+    .concat(
+      Array.isArray(matrix) ?
+        matrix.reduce((acc, cur) => acc.concat(max(cur)), []) :
+        matrix
+    )
+    .sort((a, b) => b - a)[0];
 
 module.exports = { max };

Exercises/7-ages.js

@@ -1,19 +1,10 @@
 '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 lifeTime = {};
+  for (const key in persons)
+    lifeTime[key] = persons[key].died - persons[key].born;
+  return lifeTime;
 };
 
 module.exports = { ages };