Comment by tmtvl

The right way is putting the pipe operator at the beginning of the expression.

  (-> (gather-some-data)
    (map 'Vector #'some-functor)
    (filter #'some-predicate)
    (reduce #'some-gatherer))

Or for those who have an irrational fear of brackets:

  ->
    gather-some-data
    map 'Vector #'some-functor
    filter #'some-predicate
    reduce #'some-gatherer