JAVASCRIPT

initialize javascript array variable

var arrayName = new Array();
var arrayName = new Array(Number length);
var arrayName = new Array(element1, element2, element3);

javascript initialize array

const array = new Array(5).fill(0);

console.log(array);

// [0, 0, 0, 0, 0]

Declare and Initialize Arrays in javascript

const array = Array(5).fill(''); 
// Output 
(5) ["", "", "", "", ""]

const matrix = Array(5).fill(0).map(()=>Array(5).fill(0)); 
// Output
(5) [Array(5), Array(5), Array(5), Array(5), Array(5)]
0: (5) [0, 0, 0, 0, 0]
1: (5) [0, 0, 0, 0, 0]
2: (5) [0, 0, 0, 0, 0]
3: (5) [0, 0, 0, 0, 0]
4: (5) [0, 0, 0, 0, 0]
length: 5

how to initialize an array in javascript

var array_name = [item1, item2, ...];