Use valid parameter name instead of number in square function

Author: HoussamLh

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

@@ -2,19 +2,32 @@
 // Predict and explain first BEFORE you run any code...
 
 // this function should square any number but instead we're going to get an error
+// The code will throw a **SyntaxError** because you cannot 
+// use a number (`3`) as a function parameter name.
 
 // =============> write your prediction of the error here
+// SyntaxError: Unexpected number
 
 function square(3) {
     return num * num;
 }
 
 // =============> write the error message here
+// SyntaxError: Unexpected number
 
 // =============> explain this error message here
+// In JavaScript, function parameters must be valid variable names (identifiers).  
+// Using a number like `3` directly as a parameter name is invalid syntax, 
+// so JavaScript throws a `SyntaxError: Unexpected number`.
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
+function square(num) {
+  return num * num;
+}
+
+console.log(square(3)); 
+