esolve scope and return issues in debug exercise

Author: arunkumarakilan

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

@@ -2,6 +2,11 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+// The output will be 3 for every function call. 
+// This is because the function does not have a parameter, so it ignores the values passed in the function calls. 
+// Instead, it uses the global variable num, which is set to 103. 
+// The last digit of 103 is 3, so the function always returns 3.
+// variable num inside function take the input from the global variable num in the outside of the function
 
 const num = 103;
 
@@ -15,10 +20,42 @@ 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
 // Explain why the output is the way it is
 // =============> write your explanation here
+// The function getLastDigit does not have a parameter.
+// Even though values like 42, 105, and 806 are passed when calling the function, they are ignored.
+
+// Inside the function, the variable num refers to the global variable num, which is set to 103.
+
+// Each time the function runs, it converts 103 to a string and extracts the last character using slice(-1).
+
+// The last digit of 103 is "3".
+
+// Therefore, every function call returns "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)}`);
+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
+// In the previous version, the function was not working properly because it used a global variable instead of a parameter. 
+// Since the function did not define a parameter, it ignored the values passed during the function calls and always used the same global value.
+
+// In the corrected version, the global variable was removed and a parameter num was added to the function definition. 
+// Now, the function receives the argument passed during each function call and correctly returns the last digit of that number.
+
+// Therefore, the output becomes:
+
+// The last digit of 42 is 2
+// The last digit of 105 is 5
+// The last digit of 806 is 6