sprint 3 ex3.2 solution

Author: Yama948

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 : Even though the function calls pass in different numbers (42, 105, 806), the getLastDigit function doesn't take an input at all all three lines will print the same result: the last digit of 103, which is 3 — regardless of what number is passed in. 
 
 const num = 103;
 
@@ -15,10 +15,21 @@ 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
+: the arguments 42, 105, and 806 are being passed into getLastDigit(42) etc., but since the function is defined as function getLastDigit() — with empty parentheses — it has no parameters to receive those values. The passed-in arguments are simply discarded. inside the function isn't a parameter at all — it's referring to the completely separate outer num variable (103) via closure/scope, which is why every call gives the same answer regardless of input.
 // 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