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maplist
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;; Leiningen 2.3.2 | |
;; Clojure 1.5.1 | |
;; REPL | |
;; | |
(defn maplist [f coll] (map #(apply f %) (take (count coll) (iterate rest coll)))) | |
(maplist min (range 10)) | |
;; (0 1 2 3 4 5 6 7 8 9) | |
(maplist max (range 10)) | |
;; (9 9 9 9 9 9 9 9 9 9) | |
(maplist * (range 1 11)) | |
;; (3628800 3628800 1814400 604800 151200 30240 5040 720 90 10) | |
(maplist + (range 1 11)) | |
;; (55 54 52 49 45 40 34 27 19 10) |
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// sbt 0.12 | |
// scala 2.10.2 | |
// console mode | |
// | |
val lst = 1 to 10 toList | |
// warning: there were 1 feature warning(s); re-run with -feature for details | |
// lst: List[Int] = List(1, 2, 3, 4, 5, 6, 7, 8, 9, 10) | |
lst.scanRight(1)(_ * _) | |
// res0: List[Int] = List(3628800, 3628800, 1814400, 604800, 151200, 30240, 5040, 720, 90, 10, 1) | |
lst.scanRight(0)(_ + _) | |
// res1: List[Int] = List(55, 54, 52, 49, 45, 40, 34, 27, 19, 10, 0) | |
// no min/max for scanRight because scan(Left|Right) needs an Identity Element (http://en.wikipedia.org/wiki/Identity_element) | |
// UPDATE on 2013-11-05 | |
lst.tails.toList | |
// res24: List[List[Int]] = List(List(1, 2, 3, 4, 5, 6, 7, 8, 9, 10), List(2, 3, 4, 5, 6, 7, 8, 9, 10), List(3, 4, 5, 6, 7, 8, 9, 10), List(4, 5, 6, 7, 8, 9, 10), List(5, 6, 7, 8, 9, 10), List(6, 7, 8, 9, 10), List(7, 8, 9, 10), List(8, 9, 10), List(9, 10), List(10), List()) <- Empty List is here! | |
lst.tails.toList.filter(_.size>0) | |
// res25: List[List[Int]] = List(List(1, 2, 3, 4, 5, 6, 7, 8, 9, 10), List(2, 3, 4, 5, 6, 7, 8, 9, 10), List(3, 4, 5, 6, 7, 8, 9, 10), List(4, 5, 6, 7, 8, 9, 10), List(5, 6, 7, 8, 9, 10), List(6, 7, 8, 9, 10), List(7, 8, 9, 10), List(8, 9, 10), List(9, 10), List(10)) <- Empty List is not here! |
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(require 'cl) | |
(maplist #'(lambda (x) (apply #'* x)) (loop for i from 1 to 10 collect i)) | |
;; (3628800 3628800 1814400 604800 151200 30240 5040 720 90 10) |
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