profit

; response to http://toinfinity.wordpress.com/2010/05/01/does-groovy-know-you-are-seeing-clojure
; tell the gnomes! phase two is (map - closing-prices)!
; prior to 1.2, reductions is in clojure.contrib.seq-utils

(->> (reductions min closing-prices)  ;; lowest prices at each point
     (map - closing-prices)           ;; possible profit at each point
     (apply max))                     ;; profit!

Thank you. I will examine. I was using 1.1.0.

@ clojure.core ->> has the note {:added "1.1"}

choas: you'd think I'd know that given that I committed that note. :-) Good catch, fixed.