JSFiddle - React, Tailwind, and code Playground

JavaScript

var data = [[1, 2, 3, 4, 5], ["dog", "cat", "fish"]];

var cp = cartesianProduct(data);
console.log(cp)

function cartesianProduct(arr)
{
    var result = [[]];   

    for (i = 0; i < arr.length; i++)
    {
        var subArray = arr[i];
        var temp = [];

        for (var j = 0; j < result.length; j++)
        {
            for (var k = 0; k < arr[i].length; k++)
            {
                //concatArrays(result[j], subArray[k]);
                //temp.push(result[j]);
                temp.push(result[j].concat(subArray[k]));
            }
        }
        result = temp;
    }

    return result;
}

function concatArrays(a, b)
{
    for (var i = 0; i < b.length; i++) a.push(b[i]);
}