Labs 1-7

Exercises/1-for.js

@@ -1,9 +1,10 @@
 '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 res = 0;
+ for (let i = 0; i < args.length; i++) {
+ res += args[i];
+ } return res;
 };
 
 module.exports = { sum };

Exercises/2-for-of.js

@@ -1,9 +1,10 @@
 '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 res = 0;
+ for (const value of args) {
+ res += value;
+ } return res;
 };
 
 module.exports = { sum };

Exercises/3-while.js

@@ -1,9 +1,10 @@
 '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 result = 0;
+ while (args.length > 0) {
+ result += args.pop();
+ } return result;
 };
 
 module.exports = { sum };

Exercises/4-do-while.js

@@ -1,9 +1,12 @@
 '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
+ if (args.length === 0) return 0;
+ let result = 0;
+ do {
+ result += args.pop();
+ } while (args.length > 0);
+ return result;
 };
 
 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, cur) => acc + cur), 0);
 
 module.exports = { sum };

Exercises/6-matrix.js

@@ -1,9 +1,32 @@
 '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 value = matrix[0][0];
+ for (const index in matrix) {
+ const line = matrix[index];
+ for (const index2 in line) {
+ const colum = line[index2];
+ if (colum > value) value = colum;
+ }
+ }
+ return value;
 };
 
+/*const max = matrix => {
+ let value = matrix[0][0];
+ for (const arr of matrix) {
+ for (const i of arr) {
+ if (i > value) value = i;
+ }
+ }
+ return value;
+};*/
+
+/*const max = matrix => {
+ const modeMatrix = matrix
+ .map(arr => arr.reduce((a, b) => (a > b ? a : b)))
+ .reduce((a, b) => (a > b ? a : b));
+ return modeMatrix;
+};*/
+
 module.exports = { max };

Exercises/7-ages.js

@@ -1,19 +1,12 @@
 '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 age = {};
+ for (const key in persons) {
+ const person = persons[key];
+ age[key] = person.died - person.born;
+ }
+ return age;
 };
 
 module.exports = { ages };