Refactor functions to return values instead of logging; update explanations and predictions in comments

Author: Baba05206

Sprint-2/2-mandatory-debug/0.js

@@ -1,14 +1,27 @@
 // Predict and explain first...
-
+/*
+The function 'multiply' does not return any value, it only logs the product of 'a' and 'b' to the console, within itself. 
+Therefore, when we try to use its result in a template literal, it will be 'undefined'.
+In the below, i expect the TWO outputs to be, 320 and The result of multiplying 10 and 32 is undefined.
+*/
 // =============> write your prediction here
-
+/*
 function multiply(a, b) {
   console.log(a * b);
 }
 
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
-
+*/
 // =============> write your explanation here
-
+/*
+1. I will change the function to return the product of 'a' and 'b' instead of logging it. 
+This way, when we call 'multiply(10, 32)', it will return 320,
+ which can then be used in the template literal.
+*/
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function multiply(a, b) {
+  return a * b;
+}
+
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);

Sprint-2/2-mandatory-debug/1.js

@@ -1,13 +1,29 @@
 // Predict and explain first...
-//  =============> write your prediction here
 
+//  =============> write your prediction here
+/*
+The function 'sum' does not return the sum of 'a' and 'b' because there is a semicolon immediately after the 'return' statement.
+This causes the function to return 'undefined' instead of the intended sum.
+*/
+/*
 function sum(a, b) {
   return;
   a + b;
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
-
+*/
 // =============> write your explanation here
+/*
+1. In JavaScript, when a 'return' statement is followed by a newline, it is treated as if there is a semicolon immediately after 'return'.
+2. This means that the function exits at the 'return' statement and does not execute the next line, which contains the actual sum operation.
+3. As a result, the function returns 'undefined' instead of the sum of 'a' and 'b'.
+4. To fix this, we need to place the expression to be returned on the same line as the 'return' statement.
+*/
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function sum(a, b) {
+  return a + b;
+}
+
+console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);

Sprint-2/2-mandatory-debug/2.js

@@ -1,8 +1,19 @@
 // Predict and explain first...
+/*
+The function 'getLastDigit' is not working properly because it does not take any parameters, yet it is being called with arguments (42, 105, 806).
+As a result, it always returns the last digit of the constant 'num', which is 103, instead of the last digit of the numbers passed to it.
+*/
+//  =============> write your prediction here
 
+/*
+ The output will be:
+ The last digit of 42 is 3
+ The last digit of 105 is 3
+ The last digit of 806 is 3
+*/
 // Predict the output of the following code:
 // =============> Write your prediction here
-
+/*
 const num = 103;
 
 function getLastDigit() {
@@ -12,13 +23,32 @@ function getLastDigit() {
 console.log(`The last digit of 42 is ${getLastDigit(42)}`);
 console.log(`The last digit of 105 is ${getLastDigit(105)}`);
 console.log(`The last digit of 806 is ${getLastDigit(806)}`);
-
+*/
 // Now run the code and compare the output to your prediction
 // =============> write the output here
+/*
+The output is:
+ The last digit of 42 is 3
+ The last digit of 105 is 3
+ The last digit of 806 is 3
+ */
 // Explain why the output is the way it is
+/*  1. The function 'getLastDigit' does not accept any parameters, so it does not use the values (42, 105, 806) passed to it when called.
+    2. Instead, it always operates on the constant 'num', which is set to 103.
+    3. The function converts 'num' to a string and retrieves the last character using 'slice(-1)', which is '3'.
+    4. Therefore, regardless of the input values, the function always returns '3', leading to the same output for all calls.
+*/
 // =============> write your explanation here
 // Finally, correct the code to fix the problem
 // =============> write your new code here
 
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
+
+function getLastDigit(num) {
+  return num.toString().slice(-1);
+}
+
+console.log(`The last digit of 42 is ${getLastDigit(42)}`);
+console.log(`The last digit of 105 is ${getLastDigit(105)}`);
+console.log(`The last digit of 806 is ${getLastDigit(806)}`);