gistfile1.txt

const SAMPLE_DATA = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];

function divideInto(data, chunkSize) {
  // make the container arrays
  const containers = [];
  for (let i = 0; i < chunkSize; i++) {
    containers[i] = [];
  }
  // push bits of data into each of the arrays;
  data.forEach((item, index) => {
    const containerIndex = (index + chunkSize) % chunkSize;
    containers[containerIndex].push(item);
  });

  return containers;
}

// console.log(divideInto(SAMPLE_DATA, 3));
// console.log(divideInto(SAMPLE_DATA, 5));
// console.log(divideInto(SAMPLE_DATA, 2));