Getting Clojure

Other Handy Map Functions

If you need to get hold of all the keys in a map—well, you can guess the function name:

(keys book)

Evaluate that expression and you will end up with a collection of the keys of your map, something like this:

(:title :author :published)

Or it might be (:published :title :author) or (:author :published :title); the maps that you create with the literal {} or the hash-map function make no promises about the order of their keys.

Sorted Maps
	There is a second flavor of map that keeps its keys sorted. You can make one of these sorted maps with the aptly named function sorted-map.

In much the same way that you can get ...