JS Practice — Built-in Objects

Object.isFrozen() — after Object.freeze

📖 Usage Example

// Check if an object is frozen
const obj = { a: 1 }
Object.isFrozen(obj)    // → false
Object.freeze(obj)
Object.isFrozen(obj)    // → true

Use Object.isFrozen() to verify that an object is fully immutable (no additions, deletions, or value changes allowed).

Object.isFrozen() after freeze

After calling Object.freeze(obj), the object becomes frozen: no new properties, no property removal, no value changes.

Challenge: Freeze an object and verify it is frozen using Object.isFrozen().

💡 Hints (1)