Replace the pre-declartion with the parameter method

Author: Fares-Bakhet

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

@@ -1,7 +1,7 @@
 // Predict and explain first...
 
-// Predict the output of the following code:
-// =============> Write your prediction here
+// Predict the output of the following code
+// =============> Write your prediction here : The code did not set any parameter/s for the function getLastDigit. So it will always take the value of num which is 103 as a default value.
 
 const num = 103;
 
@@ -14,11 +14,26 @@ 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 output should be as the return line (103."103".3).
+/* 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 :  Since .toString() converts the number to a string. The slice(-1) method extracts the last character from that string..
+
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+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
+// >>>> because the pre declared value of num with const. So the function always returns the last digit of 103 which is 3.
+// >>>> getLastDigit should take a parameter to work properly.