Find all permutation within given arrays

function find(arr) {
    const maxDepth = arr.length - 1;
    const result = [];
    function helper(newArray, arrayIndex) {
        for (let i = 0; i < arr[arrayIndex].length; i += 1) {
            const arrCopy = newArray.slice(0);
            arrCopy.push(arr[arrayIndex][i]);
            if (arrayIndex === maxDepth) {
                result.push(arrCopy);
            } else {
                helper(arrCopy, arrayIndex + 1);
            }
        }
    }
    helper([], 0);
    return result;
}

find([[1,2], [3,4], [5,6]]) // [1,3,5] [1,3,6] [1,4,6] [2,3,5] [2,4,5] [2,4,6]