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December 18, 2015 19:39
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リスト（コレクション）のインデックスを返す
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| (.indexOf [:a :b :c :d :e] :d) ;; 3 | |
| (.indexOf [:a :b :c :d :e] :x) ;; -1 |
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python でいう
["a","b","c","d","e"].index("e")