回答編集履歴
4
Racketのコード修正
answer
CHANGED
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@@ -21,21 +21,22 @@
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```Racket
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#!/usr/bin/env racket
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-
#lang racket
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+
#lang racket/base
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+
(require (only-in srfi/1 append!))
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+
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(define add-item
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(case-lambda
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-
((item items) (
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((item items) (append! items `(,item)))
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-
items)
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((item) (add-item item '()))))
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(module+ main
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;; 使用例
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(let ((list1 (add-item "test1")))
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(printf "1回目: ~a~%" list1)
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(printf "1回目: ~a~%" list1) ; 期待値: (test1)
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(let ((list2 (add-item "test2")))
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(printf "2回目: ~a~%" list2) ; 期待値: (test2)
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-
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+
)))
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```
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```Ruby
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@@ -48,10 +49,10 @@
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if __FILE__ == $0
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# 使用例
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list1 = add_item("test1")
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-
puts("1回目: #{list1}")
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puts("1回目: #{list1}") # 期待値: ["test1"]
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list2 = add_item("test2")
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-
puts("2回目: #{list2}")
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puts("2回目: #{list2}") # 期待値: ["test2"]
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end
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```
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3
Racketコードにコメント追加
answer
CHANGED
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@@ -30,10 +30,11 @@
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30
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((item) (add-item item '()))))
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31
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(module+ main
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;; 使用例
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(let ((list1 (add-item "test1")))
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-
(printf "1回目: ~a~%" list1) ; 期待値: (
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+
(printf "1回目: ~a~%" list1) ; 期待値: (test1)
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(let ((list2 (add-item "test2")))
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-
(printf "2回目: ~a~%" list2) ; 期待値: (
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+
(printf "2回目: ~a~%" list2) ; 期待値: (test2)
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37
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)))
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```
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2
Racketのコードもmelian氏の指摘通り修正。
answer
CHANGED
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@@ -25,7 +25,7 @@
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25
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26
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(define add-item
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(case-lambda
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-
((item items) (set! items (
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+
((item items) (set! items (append items `(,item)))
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items)
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((item) (add-item item '()))))
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31
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1
melian氏の指摘によるコード修正
answer
CHANGED
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@@ -79,7 +79,7 @@
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79
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#!/usr/bin/env python3
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80
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def add_item(item, items=[]):
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-
return
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+
return items + [item]
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if __name__ == '__main__':
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# 使用例
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