Distributing list items to variables in clojure

问题

When I pass this function

(into [] 
      (map #(+ %1 %2)
           [1 2]
           [5 6]))

I get this result: [6 8]

What should I do to get this: [6 7 7 8] while keeping this #(+ %1 %2) ?

Seems like map isn't the right function in this case.

回答1:

Use for when you want a Cartesian product:

user=> (for [x [1 2] y [5 6]]
  #_=>   (+ x y))
(6 7 7 8)

回答2:

for is one option as Alex answer shows. map can also be used (with mapcat) as shown below:

user=> (mapcat #(map (partial + %1) [5 6]) [1 2])
(6 7 7 8)

来源：https://stackoverflow.com/questions/15036460/distributing-list-items-to-variables-in-clojure