http://www.freecodecamp.com/narshe1412 's solution for Bonfire: Chunky Monkey

bonfire-chunky-monkey.js

// Bonfire: Chunky Monkey
// Author: @narshe1412
// Challenge: http://www.freecodecamp.com/challenges/bonfire-chunky-monkey
// Learn to Code at Free Code Camp (www.freecodecamp.com)

function chunk(arr, size) {
  // Break it up.
  var result = [];
  var innerArray = [];
  for (var i=0; i<arr.length; i+=size) {
    innerArray.push(arr.slice(i,i+size));
  }
  return innerArray;
}

chunk(["a", "b", "c", "d"], 2);