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n日後を返す関数を返す関数 (Nested Flatten)
Squeak Smalltalk で。
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| fiveDaysLater now |
fiveDaysLater := [:n | [:date | date + n days]] value: 5.
now := DateAndTime now.
^now -> (fiveDaysLater value: now)

"=> 2007-07-21T23:47:36+09:00->2007-07-26T23:47:36+09:00 "

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