Hey guys, i'm beginner and need help.
I have a task:
;; (join* (join* student-subject :student_id student :id) :subject_id
subject :id)
;; => [{:subject "Math", :subject_id 1, :surname "Ivanov", :year 1998,
:student_id 1, :id 1}
;; {:subject "Math", :subject_id 1, :surname "Petrov", :year 1997,
:student_id 2, :id 2}
;; {:subject "CS", :subject_id 2, :surname "Petrov", :year 1997,
:student_id 2, :id 2}
;; {:subject "CS", :subject_id 2, :surname "Sidorov", :year 1996,
:student_id 3, :id 3}]
;;
;; Hint: reduce, conj, merge, first, filter, get
;; Here column1 belongs to data1, column2 belongs to data2.
(defn join* [data1 column1 data2 column2]
)
so.. i'm trying to write join (defn join* [data1 col1 data2 col2] ... )
data1 and data2 like: ({:key1 val1 :key2 val2} {:key1 val3 :key2 val4})
after => example result.
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