Question

According to Mark’s awesome tutorial page, “The map function applies a given function that takes one parameter to each item in a collection, returning a lazy sequence of the results”.

Yet when I do the following:

(def input-message-list (range 100 126))

(defn test-123 [in]
  (println "doing " in)
  (str "out " in))

(def output-test (map
                   test-123
                   input-message-list))

(first output-test)

, in the REPL I get the println side effects for the full range, not just the first element!

What is going on here people?

Answer 1

Already answered in here:

as really 32 elements are evaluated at a time

Your range has less than 32 elements.