| メソッド | 説明 |
|---|---|
| nil? | 変数の値がnilまたは値なしの場合に真 |
| empty? | 変数の値が空文字や値が空白の場合に真 |
| blank? | nil?やempty?が真となる場合に真 |
| present? | blank?の逆。値がある場合に真 |
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