JS Practice — Built-in Objects

Object.freeze() — returns same reference

📖 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() return value

Object.freeze returns the same object that was passed in — not a copy.

Challenge: Implement frozenRef(obj) that freezes obj and returns whether the frozen result === the original.

frozenRef({ a: 1 }) // → true

💡 Hints (1)

• `Object.freeze` mutates and returns the same reference, unlike `Object.assign` which can take a fresh target.