Object.isFrozen

Returns true if existing property attributes and values cannot be modified in an object, and new properties cannot be added to the object.

Syntax

isFrozen(object)

Parameters

• object

  An object.

Return value

true if the object is frozen, otherwise false.

Examples

let obj = {}
Object.freeze(obj)
Object.isFrozen(obj)

true

let obj = {}
Object.isFrozen(obj)

false

let obj = {}
Object.preventExtensions(obj)
Object.isFrozen(obj)

false