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

bonfire-chunky-monkey#.js

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

function chunk(arr, size) {
  var subArr=[];
  
  for (var i=0;i<arr.length;i=i+size){
    subArr.push(arr.slice(i,i+size));
    
  }
  
  return subArr;
}

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