javascript unpack array 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: array destructuring

//Without destructuring

const myArray = ["a", "b", "c"];

const x = myArray[0];
const y = myArray[1];

console.log(x, y); // "a" "b"

//With destructuring

const myArray = ["a", "b", "c"];

const [x, y] = myArray; // That's it !

console.log(x, y); // "a" "b"

Example 3: javascript destructing

/*
* On the left-hand side, you decide which values to unpack from the right-hand
* side source variable.
* 
* This was introduced in ES6
*/
const x = [1, 2, 3, 4, 5]
const [a, b] = x
console.log(a) // prints out: 1
console.log(b) // prints out: 2