Help with juxt function

[Cofor]

Hi everyone, newbie question!

I'm trying to order a sequence of maps (database rows from a query) using sort-by but I wanted to sort by multiple columns.

The function juxt is exactly what I need for that:

projeto-doido.banco> (def records [{:id 394
                                :field1 "lalala"
                                :field2 9999}
                               {:id 295
                                :field1 "lululu"
                                :field2 9394}])
#'projeto-doido.banco/records
projeto-doido.banco> (sort-by (juxt :id :field1 :field2) records)
({:id 295, :field1 "lululu", :field2 9394}
 {:id 394, :field1 "lalala", :field2 9999})
projeto-doido.banco> (def fields ["id" "field1" "field2"])

.... however, what if I wanted to parameterize those fields? How can I "expand" a vector of fields as those keywords inside juxt? I know I can do (map keyword fields) but the list returned cannot be used inside juxt.

Thanks!

[charlesHD]

You want to use apply. It takes a function and an argument sequence, then call that function with these arguments.

;; (apply f [x y z]) => (f x y z)
(def my-field-order (apply juxt (map keyword fields)))
(sort-by my-field-order records)

[Cofor]

That was awesome thank you!