Question

I am attempting to iterate over a vector of “lines” in Clojure. Essentially, it looks like:

[{:start {:x 1 :y 3 :z 4}, :end {:x 3 :y 7 :z 0}}, ...]

I would like to apply a function that prints each of these “lines” onto a new line, ala:

(map #(println %) vector-of-lines)

but that doesn’t appear to call the function. Should I not be using the “map” function in this instance?

Answer 1

(dorun (map println vector-of-lines))

dorun forces the evaluation of the lazy sequence, but also discards the individual results of each of item in the sequence. This is perfect for sequences that are purely for side-effects which is exactly what you want here.