Spread & Rest with Objects

Spreading objects

... copies an object's own properties into a new one — great for immutable updates.

const user = { name: "Ada", age: 36 };
const updated = { ...user, age: 37 };
console.log(updated);  // { name: 'Ada', age: 37 }

Rest in destructuring

Pull specific keys out and gather everything else into a new object.

const { name, ...rest } = { name: "Ada", age: 36, city: "London" };
console.log(name);  // Ada
console.log(rest);  // { age: 36, city: 'London' }

Shallow copy only

Spread makes a shallow copy — nested objects inside are still shared by reference.