function chunk(array, size, guard) {
  if (guard ? isIterateeCall(array, size, guard) : size === undefined) {
    size = 1;
  } else {
    size = nativeMax(toInteger(size), 0);
  }

  var length = array == null ? 0 : array.length;

  if (!length || size < 1) {
    return [];
  }

  var index = 0,
      resIndex = 0,
      result = Array(nativeCeil(length / size));

  while (index < length) {
    result[resIndex++] = baseSlice(array, index, index += size);
  }

  return result;
}
Creates an array of elements split into groups the length of `size`.
If `array` can't be split evenly, the final chunk will be the remaining
elements.

@static
@memberOf _
@since 3.0.0
@category Array
@param {Array} array The array to process.
@param {number} [size=1] The length of each chunk
@param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
@returns {Array} Returns the new array of chunks.
@example

_.chunk(['a', 'b', 'c', 'd'], 2);
// => [['a', 'b'], ['c', 'd']]

_.chunk(['a', 'b', 'c', 'd'], 3);
// => [['a', 'b', 'c'], ['d']]