回答編集履歴
1
追記
test
CHANGED
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@@ -10,6 +10,8 @@
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10
10
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11
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=> ["日本"]
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+
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+
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[3] pry(main)> a = ["アメリカ", "オーストラリア", "日本", "ロシア", "中国"]
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=> ["アメリカ", "オーストラリア", "日本", "ロシア", "中国"]
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@@ -18,6 +20,18 @@
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=> ["日本", "中国"]
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+
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+
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+
[5] pry(main)> len = a.map(&:length).min
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=> 2
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[6] pry(main)> a.select{|x| x.length == len}
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=> ["日本", "中国"]
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+
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+
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```
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