Freeze and seal objects in javascript

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in javascript, freezing and sealing objects are two techniques used to control object mutability. the `object.freeze()` method prevents any modifications to an object, making it immutable. once an object is frozen, its properties cannot be added, removed, or altered, and attempts to do so will fail silently in non-strict mode or throw an error in strict mode. this is useful for ensuring that certain data remains constant throughout the application's lifecycle.

on the other hand, `object.seal()` allows modification of existing properties but prevents the addition or removal of properties. sealed objects can still have their existing properties changed, but no new properties can be introduced. this technique is beneficial when you want to maintain a specific structure while allowing some level of modification. both methods help in enforcing stricter data integrity and help in avoiding unintended side effects in complex applications.
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