javascript nested array destructuring

let arr = [1, 2, 3, 4, [100, 200, 300], 5, 6, 7];

// nested array destructuring
const [a, , , , [, b, ,], , , ,] = arr;

console.log(a);
// expected output "1"

console.log(b);
// expected output "200"//simple example with object------------------------------
let obj = {name: 'Max', age: 22, address: 'Delhi'};
const {name, age} = obj;

console.log(name);
//expected output: "Max"

console.log(age);
//expected output: 22

console.log(address);
//expected output: Uncaught ReferenceError: address is not defined

// simple example with array-------------------------------
let a, b, rest;
[a, b] = [10, 20];

console.log(a);
// expected output: 10

console.log(b);
// expected output: 20

[a, b, ...rest] = [10, 20, 30, 40, 50];

console.log(rest);
// expected output: Array [30,40,50]