JS Practice — Built-in Objects

Object.freeze() — prevent modification

📖 Usage Example

// Make an object immutable
const obj = Object.freeze({ x: 1 })
obj.x = 99   // silently ignored
obj.x        // → 1

Use Object.freeze() to make an object immutable, preventing any additions, deletions, or value changes.

Object.freeze()

Object.freeze(obj) makes an object immutable: you cannot add, remove, or change its properties. In non-strict mode, modifications silently fail.

Challenge: Implement freezeObj(obj) that freezes obj and returns it.

const o = freezeObj({ a: 1 })
o.a = 99   // silently fails
o.a        // → 1

💡 Hints (2)