Fix getLastDigit function parameter

Author: anitahy73

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

@@ -1,7 +1,7 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> Write your prediction here:I predict the output will be 3 every time, because the function uses the global constant num = 103 instead of using the numbers passed into getLastDigit().
 
 const num = 103;
 
@@ -14,11 +14,28 @@ 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
+// =============> 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
+// =============> write your explanation here:there is no parameter in the function.
+//So when we call the function:
+//getLastDigit(42)
+//the 42 is passed to the function, but the function has no parameter to receive it.
+//Instead, it uses the global variable (const num = 103)
+//so every call converts 103 to a string and gets its last digit: 3.
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+// =============> write your new code here:
+const num = 103;
+
+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