Show Output
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>JavaScript Cannot Assign to Undeclared Variable in Strict Mode</title> </head> <body> <script> "use strict"; function doSomething() { msg = "Hi, there!"; // ReferenceError: msg is not defined return msg; } console.log(doSomething()); </script> <p><strong>Note:</strong> Please check out the browser console by pressing the f12 key on the keyboard.</p> </body> </html>
