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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>JavaScript Set the Properties of an Object</title> </head> <body> <script> let person = { name: "Peter", age: 28, gender: "Male" }; // Setting a new property person.country = "United States"; document.write(person.country + "<br>"); // Prints: United States person["email"] = "peterparker@mail.com"; document.write(person.email + "<br>"); // Prints: peterparker@mail.com // Updating existing property person.age = 30; document.write(person.age + "<br>"); // Prints: 30 person["name"] = "Peter Parker"; document.write(person.name); // Prints: Peter Parker </script> </body> </html>
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