Labs 1-7

Author: MaksGovor

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 };