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@geshi

blank / empty / nil の使い分け

Last updated at Posted at 2015-06-09
@book = Book.find(100000)
@book.nil? true
@book.blank? true
@book.empty? undefined method 'empty?'
 
@jfalda.nil? true
@jlfjad.blank? true
@fajjfa.empty? undefined method 'empty?'

blank = empty + nil + (空白文字列(" "))

nil? オブジェクトクラス
blank? オブジェクトクラス
empty? Arrayクラス

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