JS Practice — Built-in Objects

Object.fromEntries() — reverse of Object.entries

📖 Usage Example

// Build an object from [key, value] pairs
const entries = [['a', 1], ['b', 2]]
Object.fromEntries(entries)   // → { a: 1, b: 2 }

Use Object.fromEntries() to convert an iterable of [key, value] pairs into a plain object.

Object.fromEntries() — round-trip with Object.entries

Object.fromEntries(Object.entries(obj)) creates a shallow clone of obj. This demonstrates the inverse relationship.

Challenge: Implement roundTrip(obj) that does Object.fromEntries(Object.entries(obj)).

roundTrip({ a: 1, b: 2 }) // → { a: 1, b: 2 }

💡 Hints (1)