Spread

Array Spread

const itemList = [1, 2, 3];
const additionalItemList = [5, 6];
​
const newItemList = [...itemList, 4, ...additionalItemList];
​
console.log(newItemList); // [1, 2, 3, 4, 5, 6]

Object Spread

Très pratique pour respecter l'immutabilité.

const user = {
firstName: 'Foo',
lastName: 'BAR',
};
​
const newUser = {
...user,
phoneNumber: '+6 12 34 56 78'
};
​
console.log(newUser);
// {
// firstName: 'Foo',
// lastName: 'BAR',
// email: '[email protected]',
// phoneNumber: '+6 12 34 56 78'
//}

​