更改函数中的全局切片

map[string][]InteractiveItems

func (r *room) getItem(arg string) InteractiveItem {
for i, val := range r.interactiveItems {
    for _, item := range val {
        if item.getName() == arg {
            var idxToDelete int
            for idx := range val {
                if val[idx].getName() == arg {
                    idxToDelete = idx
                    break
                }
                if len(val) == 0 {
                    delete(r.interactiveItems, i)
                }
            }
            val = append(val[:idxToDelete], val[idxToDelete+1:]...)
            return item
        }
    }
}
return nil

val 功能区内部正在发生变化,但房间的地图却没有。我应该如何处理删除切片元素的指针?