Fixed getLastDigit() to use parameter instead of hardcoded value and added explanation

Author: Eugenie-A

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

@@ -2,7 +2,9 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+// Prediction: The function will always return "3" because it uses the hardcoded value 103.
 
+/* Original code:
 const num = 103;
 
 function getLastDigit() {
@@ -12,13 +14,35 @@ 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 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
+// MDN Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions#function_parameters
+
+// The function does not use the input number passed in.
+// It always returns the last digit of the variable `num`, which is 103.
+// To fix this, the function should accept a parameter and use that instead of the hardcoded value.
+
 // 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
+
+// The original function was not working as it wasn't taking any parameters and always used the variable `num = 103`.
+// So no matter what number you passed in, the function would ignore it and always returned the hardcoded value, "103" 
+// instead, which was "3", in this case.