Split array into N number of arrays

const splitArray = (inArray, buckets) => {
  return inArray.reduce((retArr, value, index) => {
    const bucket = index % buckets;
    if (!retArr[bucket]) {
      retArr[bucket] = [];
    }
    retArr[bucket].push(value)
    return retArr
  }, [[]]);
}

const arr = 'ABCFEFGHIJKLMNOPQRSTUVWXYZ'.split('');
const splitted = splitArray(arr, 3);
/*
output:
[
  [
    "A",
    "F",
    "G",
    "J",
    "M",
    "P",
    "S",
    "V",
    "Y"
  ],
  [
    "B",
    "E",
    "H",
    "K",
    "N",
    "Q",
    "T",
    "W",
    "Z"
  ],
  [
    "C",
    "F",
    "I",
    "L",
    "O",
    "R",
    "U",
    "X"
  ]
]
*/