Object.seal() 🔐 in JavaScript Explained in Seconds! | JS Interview Prep #coding #seal #javascript

In this short, we dive into the Object.seal() method in JavaScript using a familiar example featuring our favorite chemistry teacher, Walter White 👨‍🔬. We start by defining an object person with firstName and age. Then we apply Object.seal(person), which locks down the structure of the object. What does that mean?

Once an object is sealed:

✅ You can still update existing property values (e.g., age = 51 works fine).

❌ You can’t add new properties (e.g., person.city = "Albuquerque" will silently fail in non-strict mode).

❌ You can’t delete existing properties (e.g., delete person.firstName won’t work either).

This is super useful when you want to prevent structural changes to an object while still allowing value updates. It’s a common topic in JavaScript interviews and a great tool for enforcing data integrity in your applications.

If you're preparing for frontend interviews or just leveling up your JS fundamentals, make sure to get comfortable with methods like Object.freeze() and Object.seal(). Small differences, big impact.
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