JAVASCRIPT

creating a 2d array in js

var x = new Array(10);

for (var i = 0; i < x.length; i++) {
  x[i] = new Array(3);
}

console.log(x);

javascriopt initialize 2d array with size

function makeArray(w, h, val) {
    var arr = [];
    for(let i = 0; i < h; i++) {
        arr[i] = [];
        for(let j = 0; j < w; j++) {
            arr[i][j] = val;
        }
    }
    return arr;
}

creating 2d array in javascript

var [r, c] = [5, 5]; 
var m = Array(r).fill().map(()=>Array(c).fill(0));

js initialize 2d array

let data = [];
for (let row=0; row<rows; row++) {
    data.push(new Array(cols).fill('#'));
};