JS Practice — Built-in Objects

Object.assign() — multiple sources

📖 Usage Example

// Merge source into target
const target = { a: 1 }
Object.assign(target, { b: 2 })   // → { a: 1, b: 2 }

Use Object.assign() to copy properties from one or more source objects into a target object.

Object.assign() with multiple sources

Object.assign accepts any number of source objects. Properties are applied left-to-right, so later sources overwrite earlier ones.

Challenge: Implement mergeAll(target, ...sources) that merges all sources into target.

mergeAll({}, { a: 1 }, { b: 2 }, { c: 3 }) // → { a: 1, b: 2, c: 3 }

💡 Hints (2)