Getting Clojure

Laziness in Practice

To really get our arms around lazy sequences, let’s try a more interesting example. Suppose we needed some more or less randomly generated book maps for testing. We could sit down and manually cook up some nonsense books like this:

(def test-books
  [{:author "Bob Jordan", :title "Wheel of Time, Book 1"}
   {:author "Jane Austen", :title "Wheel of Time, Book 2"}
   {:author "Chuck Dickens", :title "Wheel of Time, Book 3"}
   {:author "Leo Tolstoy", :title "Wheel of Time, Book 4"}
   {:author "Bob Poe", :title "Wheel of Time, Book 5"}
   {:author "Jane Jordan", :title "Wheel of Time, Book 6"}
   {:author "Chuck Austen", :title "Wheel of Time, Book 7"}])

This will work, but armed with lazy sequences ...