Fix getLastDigit function

Author: Jestavo1

Sprint-3/2-mandatory-debug/2.js

@@ -1,24 +1,41 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
+// Prediction: I predict that the program will print 3 for all
+// three numbers because the function always uses the value 103.
+
 // =============> Write your prediction here
 
 const num = 103;
 
-function getLastDigit() {
-  return num.toString().slice(-1);
+function getLastDigit(number) {
+  return number.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
+// Output after correction:
+// The last digit of 42 is 2
+// The last digit of 105 is 5
+// The last digit of 806 is 6
+
 // =============> write the output here
-// Explain why the output is the way it is
+
+// Explanation: The original getLastDigit function did not have
+// a parameter, so the numbers 42, 105, and 806 passed to the
+// function were ignored. Instead, the function always used the
+// global value 103, so it returned 3 every time.
+//
+// The corrected function has a parameter called number.
+// This allows it to receive the number passed into the function.
+
 // =============> 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
+// The function now receives a number as an argument and returns
+// its last digit.