All Labs Done

Author: lizardlynx

Exercises/1-for.js

@@ -1,9 +1,15 @@
 '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 sum = 0;
+  for (let i = 0; i < args.length; i++) {
+    sum += args[i];
+  }
+  return sum;
 };
 
 module.exports = { sum };
+
+// Use for loop and accumulator variable
+// to calculate sum of all given arguments
+// For example sum(1, 2, 3) should return 6

Exercises/2-for-of.js

@@ -1,9 +1,15 @@
 '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 sum = 0;
+  for (const arg of args) {
+    sum += arg;
+  }
+  return sum;
 };
 
 module.exports = { sum };
+
+// Use for..of loop and accumulator variable
+// to calculate sum of all given arguments
+// For example sum(1, 2, 3) should return 6

Exercises/3-while.js

@@ -1,9 +1,17 @@
 '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 sum = 0;
+  while (i < args.length) {
+    sum += args[i];
+    i++;
+  }
+  return sum;
 };
 
 module.exports = { sum };
+
+// Use while loop and accumulator variable
+// to calculate sum of all given arguments
+// For example sum(1, 2, 3) should return 6

Exercises/4-do-while.js

@@ -1,9 +1,18 @@
 '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 sum = 0;
+  if (args.length == 0) return 0;
+  do {
+    sum += args[i];
+    i++;
+  } while (i < args.length);
+  return sum;
 };
 
 module.exports = { sum };
+
+// Use do..while loop and accumulator variable
+// to calculate sum of all given arguments
+// For example sum(1, 2, 3) should return 6

Exercises/5-reduce.js

@@ -1,8 +1,9 @@
 'use strict';
 
-const sum = (...args) => 0;
+const sum = (...args) => args.reduce((s, c) => s += c, 0);
+
+module.exports = { sum };
+
 // Use Array.prototype.reduce method
 // to calculate sum of all given arguments
 // For example sum(1, 2, 3) should return 6
-
-module.exports = { sum };

Exercises/6-matrix.js

@@ -1,9 +1,19 @@
 '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 max = 0;
+  for (const array of matrix) {
+    for (const item of array) {
+      if (item > max) {
+        max = item;
+      }
+    }
+  }
+  return max;
 };
 
 module.exports = { max };
+
+// 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

Exercises/7-ages.js

@@ -1,19 +1,27 @@
 '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 = {};
+  for (const name in persons) {
+    const person = persons[name];
+    ages[name] = person.died - person.born;
+    console.log(ages);
+  }
+  return ages;
 };
 
 module.exports = { ages };
+
+// 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,
+// }