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function chunkArrayInGroups(arr, size) {
    var newArray = [];
    var oldArray = arr.length/size;
    for (var i = 0; i < oldArray; i++) {
      var array = arr.splice(0, size);
      newArray.push(array);
    }
 
  return newArray;
    
  // Break it up.

}

chunkArrayInGroups([0, 1, 2, 3, 4, 5], 2);