js unpack list code example

Example 1: unpack list javascript

var yourArray = [1, 2, 3, "four"]
// you can unpack those values by doing:
[a, b, c, d] = yourArray // If you want to unpack in variables

...yourArray // If you want to unpack directly where the "..." is (This One is mostly used to give argument to a function)
//Exemple:
consloe.log(yourArray) // will print: [1, 2, 3, "four"]
consloe.log(...yourArray) // will print: 1 2 3 "four"

Example 2: object destructuring

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]

Example 3: js object destructuring

const { [propName]: identifier } = expression;