Predict, explain, and fix code

Author: russom

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

@@ -3,6 +3,10 @@
 // Predict the output of the following code:
 // =============> Write your prediction here
 
+// The last digit of 42 is 3 undefined
+// The last digit of 105 is 3 undefined
+// The last digit of 806 is 3 undefined
+
 const num = 103;
 
 function getLastDigit() {
@@ -15,10 +19,31 @@ 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
+
+// Because the function is not given a parameter and it is being passed an argument the same time which it ignores. 
+// The function uses the global variable num instead and print 3
+
 // 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
+
+// The reason was the num variable wasn't declared as a parameter inside the function. 
+// At the same time the function is receiving arguments which the function ignores.