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Becoming a Functional Programmer with Clojure

Challenge: Manipulating Hash Maps

Explore how to manipulate hash maps in Clojure by working with student data. Learn to split students into classrooms based on age and create a unique list of mothers for invitations, enhancing your skills in functional data transformation and argument handling.

We'll cover the following...

Explanation

Until now, you’ve only done mathematical challenges. Now you’ll want to take a different approach. Imagine that you’re doing a job for a school, and they send you a list with students’ information.

You can see the list below. The given list structure will be your entry point argument for all the exercises.

Clojure
(def students [{:name "Andy"
                :age 10
                :gender :male
                :parents [{:name "Clara"
                           :relation :mother}
                          {:name "Kevin"
                           :relation :father}]}
                {:name "Beth"
                :age 11
                :gender :female
                :parents [{:name "Travis"
                           :relation :father}
                          {:name "Michael"
                           :relation :father}]}
                {:name "Cindy"
                :age 10
                :gender :female
                :parents [{:name "Marie"
                           :relation :mother}
                          {:name "John"
                           :relation :father}]}
                {:name "Liz"
                :age 11
                :gender :female
                :parents [{:name "Lanna"
                           :relation :mother}
                          {:name "Lourdes"
                           :relation :mother}]}
                {:name "Anna"
                :age 10
                :gender :female
                :parents [{:name "Paola"
                           :relation :mother}
                          {:name "Lucas"
                           :relation :father}]}
                {:name "Howard"
                :age 10
                :gender :male
                :parents [{:name "Fernanda"
                           :relation :mother}
                          {:name "Abel"
                           :relation :father}]}
                {:name "Johnny"
                :age 11
                :gender :male
                :parents [{:name "Marianne"
                           :relation :mother}
                          {:name "Raphael"
                           :relation :father}]}
                {:name "Lara"
                :age 11
                :gender :female
                :parents [{:name "Helouise"
                           :relation :mother}
                          {:name "Barbara"
                           :relation :mother}]}
                {:name "Kelvin"
                :age 10
                :gender :male
                :parents [{:name "Pamela"
                           :relation :mother}
                          {:name "Lincoln"
                           :relation :father}]}
                {:name "Camille"
                :age 11
                :gender :female
                :parents [{:name "Lourdes"
                           :relation :mother}
                          {:name "Matheus"
                           :relation :father}]}
                {:name "Bruno"
                :age 10
                :gender :male
                :parents [{:name "Camu"
                           :relation :mother}
                          {:name "George"
                           :relation :father}]}
                {:name "Lina"
                :age 11
                :gender :female
                :parents [{:name "Claudia"
                           :relation :mother}
                          {:name "Klaus"
                           :relation :father}]}
                {:name "Gabrielle"
                :age 11
                :gender :female
                :parents [{:name "Natalie"
                           :relation :mother}
                          {:name "Matheus"
                           :relation :father}]}
                {:name "Lucas"
                :age 10
                :gender :male
                :parents [{:name "Pamela"
                           :relation :mother}
                          {:name "George"
                           :relation :father}]}])

Each student will have the following ...