dzmitry-antonenka

    /// Deletes the array of`items`.
    /// - Parameter items: The array of items to delete.
    public func delete(_ items: [ItemIdentifierType]) -> [Int] {
        let deleteItemSet = Set(items)
        let filterPredicate: (TreeItem<ItemIdentifierType>) -> Bool = { !deleteItemSet.contains($0.value) }

        /// Depth first traversal to get include all related deleted expanded children
        let deletedItemsWithRelatedExpandedChildren = Set(
        items
            .compactMap { lookup($0) }