/// Removes all false and null values from `$list`.
///
/// @ignore Documentation: http://at-import.github.io/SassyLists/documentation/#function-sl-purge
///
/// @requires sl-is-true
/// @requires sl-to-list
///
/// @param {List} $list - list to purge
///
/// @example
/// sl-purge(null a false b)
/// // a b
///
/// @return {List}
///

@function sl-purge($list) {
  $_: sl-missing-dependencies('sl-is-true', 'sl-to-list');
  
  $result: ();

  @each $item in $list {
    @if sl-is-true($item) {
      $result: append($result, $item, list-separator($list));
    }
  }

  @return sl-to-list($result);
}

///
/// @requires sl-purge
/// @alias sl-purge
///
 
@function sl-clean($list) {
  @return sl-purge($list);
}