Complete debug exercise 2 - getLastDigit parameter

Author: salahalsabhi

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

@@ -1,24 +1,43 @@
 // Predict and explain first...
-
 // Predict the output of the following code:
 // =============> Write your prediction here
+// Prediction: All three lines print "3" because getLastDigit has no parameter
+// and always uses the outer const num = 103 (last digit 3). The arguments
+// 42, 105, and 806 are ignored.
 
-const num = 103;
 
-function getLastDigit() {
-  return num.toString().slice(-1);
-}
+//const num = 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)}`);
 
-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
+// getLastDigit() does not declare a parameter, so the values passed in
+// (42, 105, 806) are not available inside the function. It reads the
+// global num (103) every time, so slice(-1) always returns "3".
+
 // 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
+
+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)}`);