Declare an empty two-dimensional array in Javascript?

Question

I want to create a two dimensional array in Javascript where I\'m going to store coordinates (x,y). I don\'t know yet how many pairs of coordinates I will have because they

Answer 1

One line solution:

var x = 3, y = 4;

var ar = new Array(x).fill(new Array(y).fill(0));

It creates matrix array with values = 0