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Becoming a Functional Programmer with Clojure

Challenge: Manipulating Hash Maps

Explore how to handle hash maps in Clojure through practical exercises involving student data. Learn to split students into classrooms by age and generate a unique list of mothers' names, developing skills in data transformation, function design, and argument flexibility within Clojure.

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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 parameters:

  • name: This is a String with the name of the student.

  • age: This is an Integer with the age of the student.

  • gender: This is a keyword that can only be ...