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

bonfire-chunky-monkey.js

// Bonfire: Chunky Monkey
// Author: @joepichardo
// 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.
  
  //two empty arrays to make a two dimensional array
  var outerArray = [];
  var innerArray = [];
  
  //go through the arr and push numbers to our innerArray
  //(i+1) is used in the if statement since index and length are different by 1
  //if there is a remainder of 0 or we reached the end of array length
  //push this innerArray to our OuterArray, then empty the innerArray
  // for the next loop
  for(var i = 0; i < arr.length; i++){
    innerArray.push(arr[i]);
    if( (i+1) % size === 0 || i == arr.length-1){
      outerArray.push(innerArray);
      innerArray = [];
    }
  }
  
  return outerArray;
}

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