In 2-mandatory-debug/2.js, adding a parameter in the function

Author: TzeMingHo

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

@@ -2,23 +2,42 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+// The output should always be 3 because the parameter is not defined in the function,
+// and the variable num is always 103 in the global scope.
 
 const num = 103;
-
+/*
 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)}`);
-
+*/
 // Now run the code and compare the output to your prediction
 // =============> write the output here
+/*
+The last digit of 42 is 3
+The last digit of 105 is 3
+The last digit of 806 is 3
+*/
+// As expected, the output is always 3.
+
 // Explain why the output is the way it is
 // =============> write your explanation here
+//The num is defined in the global scope as 103.
+// And the function does not accept any parameters.
+// So every time the function is called, it returns the last digit of 103, which is 3.
+
 // 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)}`); // should return 2
+console.log(`The last digit of 105 is ${getLastDigit(105)}`); // should return 5
+console.log(`The last digit of 806 is ${getLastDigit(806)}`); // should return 6
 
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem