Object Descriptors & Property Flags

Object.isFrozen() checks whether an object is frozen: 1) It returns true if the object is frozen, false otherwise, 2) An object is considered frozen when all its properties are non-configurable and non-writable, and no new properties can be added, 3) It returns true for objects that have been passed to Object.freeze(), 4) Empty objects that are non-extensible are also considered frozen, 5) It's part of a family of testing methods including Object.isSealed() and Object.isExtensible(), 6) These methods are useful for defensive programming and feature detection, 7) They help determine the current state of an object before attempting potentially restricted operations.