Trivia: You can name fns: (map (fn first-or-last [x] (or (first x) (last x)) my-seq) (Of course the name has no semantic effects as you can'

Trivia: You can name fns: (map (fn first-or-last [x] (or (first x) (last x)) my-seq) (Of course the name has no semantic effects as you can't refer to it from code, but it's there in debugging / stack traces and serves as a comment for the reader).