In 1-key-errors/2.js, replacing 3 with num as parameter

Author: TzeMingHo

Sprint-2/1-key-errors/2.js

@@ -1,20 +1,27 @@
-
 // Predict and explain first BEFORE you run any code...
 
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
-
+// I guess the error is a reference error because the parameter is not defined correctly.
+/*
 function square(3) {
     return num * num;
 }
-
+*/
 // =============> write the error message here
+// function square(3) {
+//                 ^
+//SyntaxError: Unexpected number
+// In fact, the error is a syntax error because number 3 is unexpected here.
 
 // =============> explain this error message here
+// Number 3 is not a valid parameter name, which is misplacing and causes a syntax error.
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
-
-
+function square(num) {
+  return num * num;
+}
+console.log(square(3)); // should return 9