const chunkIntoN = (arr, n) => {
  const size = Math.ceil(arr.length / n);
  return Array.from({ length: n }, (v, i) =>
    arr.slice(i * size, i * size + size)
  );
}
EXAMPLES
chunkIntoN([1, 2, 3, 4, 5, 6, 7], 4); // [[1,2], [3,4], [5,6], [7]]