Array中的解构赋值

同时声明多个变量

const [a,b,c] = [1,2,3];
console.log(a,b,c);

赋值数组中的前n个

const [a,b] = [1,2,3,4];
console.log(a,b);

跳开赋值数组中的某几个值

const [a,,,b] = [1,2,3,4];
console.log(a,b);

两个变量交换值

let [a,b] = [1,2];
[a,b] = [b,a];
console.log(a,b);

接收函数的多个返回值

const restaurant = {
  name: 'Classico Italiano',
  location: 'Via Angelo Tavanti 23, Firenze, Italy',
  categories: ['Italian', 'Pizzeria', 'Vegetarian', 'Organic'],
  starterMenu: ['Focaccia', 'Bruschetta', 'Garlic Bread', 'Caprese Salad'],
  mainMenu: ['Pizza', 'Pasta', 'Risotto'],
order: function (starterIndex, mainIndex) {
    return [this.starterMenu[starterIndex], this.mainMenu[mainIndex]];
  },
}
const [starter, main] = restaurant.order(2, 0);

嵌套解构赋值

const nested =[1,2,[3,4]];
const [i,j,[m,n]] = nested;
console.log(i,j,m,n);

解构赋值中的默认值

const [p=0,q=0,r=0] = [8,9];
console.log(p,q,r);