explain and fix bug in getLastDigit (mandatory debug)

Author: lauracs24

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

@@ -3,22 +3,56 @@
 // Predict the output of the following code:
 // =============> Write your prediction here
 
-const num = 103;
+// I think the program will print 3 every time.
+// Even though different numbers are passed into the function,
+// the function is using the variable 'num', which is 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)}`);
+// 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
+
 // Explain why the output is the way it is
 // =============> write your explanation here
+
+// The function is not using the number that is passed into it.
+// Instead, it always uses the global variable 'num'
+// which is set to 103.
+// The last digit of 103 is 3
+// so the function always returns 3.
+
 // Finally, correct the code to fix the problem
 // =============> write your new code here
 
+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)}`);
+
+
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
+
+// The function was not working properly because it did not use
+// the number that was passed into it.
+// Instead, it used the global variable 'num',
+// which was always 103.
+// That is why it always returned 3.
+//
+// To fix the problem, I added a parameter to the function
+// and used that parameter to calculate the last digit
+