Книга: Practical Common Lisp

Other Structures

Other Structures

While cons cells and lists are typically considered to be synonymous, that's not quite right—as I mentioned earlier, you can use lists of lists to represent trees. Just as the functions discussed in this chapter allow you to treat structures built out of cons cells as lists, other functions allow you to use cons cells to represent trees, sets, and two kinds of key/value maps. I'll discuss some of those functions in the next chapter.