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update

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Ingy döt Net 2013-06-05 21:47:54 +00:00
parent 1f1ad49427
commit 6f050a029e
2496 changed files with 37609 additions and 3031 deletions
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7
Task/Repeat-a-string/Racket/repeat-a-string-1.rkt
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@ -1,4 +1,5 @@
; fast
#lang racket
;; fast
(define (string-repeat n str)
(apply string-append (make-list n str)))
(string-repeat 5 "ha") ==> "hahahahaha"
(string-append* (make-list n str)))
(string-repeat 5 "ha") ; => "hahahahaha"

8
Task/Repeat-a-string/Racket/repeat-a-string-2.rkt
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@ -1,7 +1 @@
; memory efficient
(define (string-repeat n string)
(with-output-to-string
(λ ()
(for ([_ (in-range n)])
(display string)))))
(string-repeat 5 "ha") ==> "hahahahaha"
(make-string 5 #\*) => "*****"