##present?
!blank? を実行するメソッド
nil, "", " "(半角スペースのみ), [](空の配列), {}(空のハッシュ) のときにfalseを返す
##blank?
nil? + empty? のようなメソッド
nil, false, "", " "(半角スペースのみ), [](空の配列), {}(空のハッシュ) のときにtrueを返す
##参考
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