(defn join* [d1 c1 d2 c2]
(clojure.set/join (into #{} d1) (into #{} d2) {c1 c2}))
Or else look at the implementation of set/join.
Take care,
Moe
On Tue, Oct 18, 2016 at 9:41 AM, <evgeniy.kurpa...@gmail.com> wrote:
> 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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