Object.isFrozen() static method determines if an object is frozen.

syntax ↴

Object.isFrozen(obj) ↴

obj The object which should be checked.

Object.isFrozen() returns true if an object is frozen.

Object.isFrozen() returns false if an object is not frozen.

An object is frozen ↴

if it is not extensible,

if all of its properties are non-configurable,

if all its data properties are non-writable.

Object.freeze() method freezes an object.

Freezing an object is the highest integrity level that JavaScript provides.

⇑