Published Apr 10 2019
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Accepts an object as argument, and returns true
if the object is frozen, false
otherwise. Objects are frozen when they are return values of the Object.freeze()
function.
Example:
const dog = {}
dog.breed = 'Siberian Husky'
const myDog = Object.freeze(dog)
Object.isFrozen(dog) //true
Object.isFrozen(myDog) //true
dog === myDog //true
In the example, both dog
and myDog
are frozen. The argument passed as argument to Object.freeze()
is mutated, and can’t be un-freezed. It’s also returned as argument, hence dog
=== myDog
(it’s the same exact object).