Iteration lab done

Exercises/1-for.js

@@ -1,9 +1,13 @@
 '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 result = 0;
+
+  for (let i = 0; i < args.length; i++) {
+    result += args[i];
+  }
+
+  return result;
 };
 
 module.exports = { sum };

Exercises/2-for-of.js

@@ -1,9 +1,13 @@
 '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 result = 0;
+
+  for (const item of args) {
+    result += item;
+  }
+
+  return result;
 };
 
 module.exports = { sum };

Exercises/3-while.js

@@ -1,9 +1,15 @@
 '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 i = 0;
+  let result = 0;
+
+  while (i < args.length) {
+    result += args[i];
+    i++;
+  }
+
+  return result;
 };
 
 module.exports = { sum };

Exercises/4-do-while.js

@@ -1,9 +1,15 @@
 '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 i = 0;
+  let r = 0;
+
+  do {
+    r += args[i];
+    i++;
+  } while (i < args.length);
+
+  return args.length ? r : 0;
 };
 
 module.exports = { sum };

Exercises/5-reduce.js

@@ -1,8 +1,6 @@
 '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, value) => acc += value, 0);
+
 
 module.exports = { sum };

Exercises/6-matrix.js

@@ -1,9 +1,17 @@
 '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) => {
+  let maxValue = 0;
+
+  for (let i = 0; i < matrix.length; i++) {
+    for (let k = 0; k < matrix[i].length; k++) {
+      const nestedArrayValue = matrix[i][k];
+
+      if (maxValue < nestedArrayValue) maxValue = nestedArrayValue;
+    }
+  }
+
+  return maxValue;
 };
 
 module.exports = { max };

Exercises/7-ages.js

@@ -1,19 +1,14 @@
 '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 ages = (persons) => {
+  const ages = {};
+
+  for (const person in persons) {
+    const current = persons[person];
+    ages[person] = current.died - current.born;
+  }
+
+  return ages;
 };
 
 module.exports = { ages };

package.json

@@ -5,7 +5,7 @@
   "author": "Timur Shemsedinov <timur.shemsedinov@gmail.com>",
   "license": "MIT",
   "scripts": {
-    "test": "eslint ./Exercises; hpw"
+    "test": "eslint ./Exercises && hpw"
   },
   "dependencies": {
     "eslint": "^7.23.0",