8. Namespaces, Libraries and Leiningen

Activity 8.01: Altering the Users List in an Application

Solution:

1. Import the clojure.string namespace with use and the :rename keyword for the replace and reverse functions:

   (use '[clojure.string :rename {replace str-replace, reverse str-reverse}])

2. Create a set of users:

   (def users #{"mr_paul smith" "dr_john blake" "miss_katie hudson"})

3. Replace the underscore between honorifics and first names:

   (map #(str-replace % #"_" " ") users)

   This will return the following:

   ("mr paul smith" "miss katie hudson" "dr john blake")

4. Use the capitalize function to capitalize each person's initials in the user group:

   (map #(capitalize %) users)

   This will return the following:

   ("Mr_paul smith" "Miss_katie hudson" "Dr_john blake")

5. Update the user list by using the string's replace and capitalize functions:

   (def updated-users...