isFrozen

The isFrozen function checks if an object is frozen, meaning it cannot be modified.

Syntax

isFrozen(obj): boolean

Parameters

Name	Type	Description
obj	object	Object to be checked.

Return

Type	Description
boolean	Returns true if the object is frozen, otherwise false.

Examples

const obj = Object.freeze({ a: 1 });
isFrozen(obj); // true
isFrozen({ b: 2 }); // false

Notes

• Internally uses Object.isFrozen.
• Frozen objects cannot have properties added, removed, or modified.

References

• MDN: Object.isFrozen()