JS Practice — Built-in Objects

Object.fromEntries() — transform values

📖 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() with map

Combining Object.entries, .map, and Object.fromEntries is a powerful pattern to transform object values.

Challenge: Implement doubleValues(obj) that returns a new object with all numeric values doubled.

doubleValues({ a: 1, b: 3 }) // → { a: 2, b: 6 }

💡 Hints (1)