How i can establishment 2D array on js

Question

1D array that easy but i dont know how to
use 2d array on js

Answer 1

the dimensions specify how many levels of arrays are nested into the main array.
1d
let arr=[5,6]
2d
let arr=[[5,6]
[5,6]];
3d
ler arr=[ [[5,6],[5,6]],[[5,6],[5,6]] ];

Answer 2

thank you my friend