@use 'sass:list';
@use 'is-map' as *;
@use 'to-list' as *;

/// Removes duplicate values from `$list`.
///
/// @param {List} $list - The List from which to remove duplicates.
///
/// @return {List} - The new List with duplicates removed.
///
/// @example
/// list-remove-duplicates('a' 'b' 'a' 'b')
/// // 'a' 'b'
///
/// @access public
/// @group Utilities
/// @require {function} is-map
/// @require {function} to-list
/// @since 0.15.0
@function list-remove-duplicates($list) {
  $result: ();

  @if is-map($list) {
    @error 'Invalid $list data type for the [ list-remove-duplicates() ] function. ' +
        'You may not pass a value of data type \'map\'';
  }

  @each $item in $list {
    @if not list.index($result, $item) {
      $result: list.append($result, $item, list.separator($list));
    }
  }

  @return to-list($result);
}