What is Object.seal in JavaScript?

Can you explain what Object.seal does in JavaScript?

Sure! Object.seal is a method that prevents new properties from being added to an object and marks all existing properties as non-configurable.

What happens to the existing properties when an object is sealed?

When an object is sealed, existing properties can still be modified, but they cannot be deleted or reconfigured.

Can you give me an example of how to use Object.seal?

Of course! Here's a simple example:

const obj = { name: 'Alice', age: 25 };
Object.seal(obj);
obj.age = 30; // This works
delete obj.name; // This will not work
console.log(obj); // { name: 'Alice', age: 30 }