Object.isSealed () is used to check if the object is sealed
Object.seal () is a method used to seal the object. Sealing an object: does not allow the addition of new features and preserves all existing features.
If we want to avoid adding new features to the object, we should use the Object.preventExtensions () method.
The Object.keys () method is a method for us to return the enumerable properties on an object to the array.
Object.isFrozen () is used to control whether an object is frozen. (An object is frozen by Object.freeze ()) Returns a boolean value that is true or incorrect.