@function __chunk($list, $size: null, $guard: null) {
  @if (if($guard, __is-iteratee-call($list, $size, $guard), ($size == null))) {
    $size: 1;
  } @else {
    $size: max(if(__is-falsey($size), 1, $size), 1);
  }

  $index: 1;
  $length: if($list, length($list), 0);
  $result: ();

  @while ($index <= $length) {
    $result: append(
      $result,
      __base-slice($list, $index - 1, $index + $size - 1)
    );
    $index: $index + $size;
  }

  @if (length($result) == 1) {
    $result: ($result);
  }

  @return $result;
}

/// Creates a list of elements split into groups the length of `$size`.
/// If `$collection` can't be split evenly, the final chunk will be the remaining
/// elements.
///
///
/// @access public
/// @group List
/// @param {List} $list The list to process.
/// @param {number} $size [1] - The length of each chunk.
/// @returns {List} Returns the new list containing chunks.
/// @example scss
/// $foo: _chunk(('a', 'b', 'c', 'd'), 2);
/// // => (('a', 'b'), ('c', 'd'))
///
/// $foo: _chunk(('a', 'b', 'c', 'd'), 3);
/// // => (('a', 'b', 'c'), ('d',))

@function _chunk($args...) {
  @return call(get-function("__chunk"), $args...);
}