JavaScript MCQ Javascript Classes MCQ

• A 2
• B 4
• C undefined
• D error
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D

Answer: D

The Object.seal() method in JavaScript is used to seal an object, which means that it prevents new properties from being added to the object and marks all existing properties as non-configurable. Sealed objects cannot be deleted, and their existing properties cannot be changed or removed.

To seal an object, you pass the object as an argument to the Object.seal() method and it returns the sealed object.

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Test your knowledge of JavaScript classes with our MCQ quizzes. Our website features questions on topics such as class syntax, inheritance, and method overrides, as well as how to use classes to create objects and organize code in a JavaScript application. Whether you're a beginner looking to learn about classes or an experienced developer looking to brush up on your skills, our quizzes provide a fun and effective way to learn. Try one today and see how much you know about this important programming concept.