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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>JavaScript in Operator</title> </head> <body> <pre> <!-- Use pre element for work document.writeln() method --> <script type="text/javascript"> var myObj = new Object(); // or you can write: var myObj = new Object; myObj.name = "Opal Kole"; myObj.address = "63 street Ct."; myObj.age = 48; myObj.married = true; document.writeln("name" in myObj); // Returns true document.writeln("birthdate" in myObj); // Returns false // birthdate propery not in myObj document.writeln("address" in myObj); // Returns true document.writeln("age" in myObj); // Returns true document.writeln("married" in myObj); // Returns true </script> </pre> </body> </html>