Split a list into X chunks

splitList.js

function splitList(list, chunkSize) {
  const groupSize = Math.ceil(list.length / chunkSize)
  let chunked = []
  
  for (let i = 0;  i < list.length; i += groupSize) {
    chunked.push(list.slice(i, i + groupSize))
  }
  
  return chunked
}

console.log(splitList([1, 2, 3, 4, 5, 6, 7, 8], 3)) // [ [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7, 8 ] ]
console.log(splitList([1, 2, 3, 4, 5, 6, 7, 8, 9], 2)) // [ [ 1, 2, 3, 4, 5 ], [ 6, 7, 8, 9 ] ]