chunk.js

chunk.js

function chunk(a, s){
    for(var x, i = 0, c = -1, l = a.length, n = []; i < l; i++)
        (x = i % s) ? n[c][x] = a[i] : n[++c] = [a[i]];
    return n;
}

chunk_revised.js

function chunk(list, size) {
  for(var position, i = 0, chunk = -1, chunks = []; i < list.length; i++) {
    if (position = i % size) {
      chunks[chunk][position] = list[i]
    } else {
      chunk++;
      chunks[chunk] = [list[i]]
    }
  }
  return chunks;
}