JSFiddle - React, Tailwind, and code Playground

HTML

<div id="msgs"></div>

JavaScript

// Just a helper method...
function display(str) {
   $('#msgs').append($('<div>').text(str));
}

var cubes = [
 [1, 2, 3],
 [4, 5, 6],    
 [7, 8, 9],
];

for(var i = 0; i < cubes.length; i++) {
    var cube = cubes[i];
    for(var j = 0; j < cube.length; j++) {
        display("cube[" + i + "][" + j + "] = " + cube[j]);
    }
}