update: predict the output, explain the cause of the problem, then Fix getLastDigit function to correctly return the last digit of a number and update comments for clarity in Sprint-2/2-mandatory-debug/2.js

Author: SuWebOnes

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

@@ -1,24 +1,36 @@
 // Predict and explain first...
+// This code is intended to find the last digit of a number, but it has a bug.
 
 // Predict the output of the following code:
+// Predict the output of the following code is '3' for the input 103. since the last digit of 103 is 3 and it is  a global variable, so regardless of the input, it will always return the last digit of the global variable `num` which is 103.
 // =============> Write your prediction here
 
-const num = 103;
+// const num = 103;
 
-function getLastDigit() {
-  return num.toString().slice(-1);
-}
+// function getLastDigit() {
+//   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)}`);
+// 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
+// The last digit of 42 is 3
+// The last digit of 105 is 3
+// The last digit of 806 is 3
+
 // =============> write the output here
 // Explain why the output is the way it is
 // =============> write your explanation here
+// The output is always '3' because the function `getLastDigit` is using a global variable `num` which is set to 103
 // Finally, correct the code to fix the problem
 // =============> write your new code here
-
+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)}`);
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem