Fix 2.js: use a parameter name instead of a number

Author: lamlakamana-oss

Sprint-3/1-key-errors/2.js

@@ -4,17 +4,24 @@
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+// I predict a SyntaxError, because 3 is a number, not a parameter name.
+// Function parameters must be identifiers (variable names).
 
-function square(3) {
+function square(num) {
     return num * num;
 }
 
 // =============> write the error message here
+// SyntaxError: Unexpected number
 
 // =============> explain this error message here
+// The original code was function square(3) { ... }. A function definition
+// expects a parameter name inside the brackets, but I gave it the value 3.
+// JavaScript found a number where it expected a name, so it says
+// "Unexpected number".
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
-
+console.log(square(3));