Fix 2-mandatory-debug/2.js: add num parameter to getLastDigit

Author: lamlakamana-oss

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

@@ -2,10 +2,12 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+// I predict every line will say the last digit is 3, because the function
+// ignores the number I pass in and always uses num = 103.
 
 const num = 103;
 
-function getLastDigit() {
+function getLastDigit(num) {
   return num.toString().slice(-1);
 }
 
@@ -15,10 +17,17 @@ 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
+// getLastDigit has no parameter, so the argument in getLastDigit(42) is
+// ignored. Inside the function, num refers to the global constant
+// num = 103, so it always returns "3".
 // Finally, correct the code to fix the problem
 // =============> write your new code here
-
+// I added num as a parameter: function getLastDigit(num). Now num is the
+// value I pass in, not the global num = 103.
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem