Write a function that splits an array (first argument) into groups the length of size (second argument) and returns them as a two-dimensional array.

chunkyMonkey.js

function chunkArrayInGroups(r, n) {
  var u = [],
    c = 0,
    e = n,
    h = [];
  for (i = 0; i < r.length;) u = r.slice(c, e), h.push(u), c += n, e += n, i += n;
  return h
}