Fixed empty return in sum() and added explanation with MDN reference

Author: Eugenie-A

Sprint-2/2-mandatory-debug/1.js

@@ -1,13 +1,32 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// Prediction: The code should output - "The sum of 10 and 32 is 42"
+// But the code will return undefined instead of 42.
 
+/* Original code
 function sum(a, b) {
   return;
   a + b;
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+*/
+
+// =============> Error message
+// The sum of 10 and 32 is undefined
 
 // =============> write your explanation here
+// MDN Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/return
+
+// The function uses `return;` without an expression.
+// According to MDN, if a return statement has no value, the function returns undefined.
+// So when `sum(10, 32)` is called, it returns undefined.
+// To fix this, the return statement must include the expression `a + b`.
+
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function sum (a, b) {
+  return a + b;
+}
+
+console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);