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copied!<p>AFAIK there isn't anything like this in plain Ruby. You can create your own like this:</p> <pre><code>class NilClass def blank? true end end class String def blank? self.strip.empty? end end </code></pre> <p>This will work for <code>nil.blank?</code> and <code>a_string.blank?</code> you can extend this (like rails does) for true/false and general objects:</p> <pre><code>class FalseClass def blank? true end end class TrueClass def blank? false end end class Object def blank? respond_to?(:empty?) ? empty? : !self end end </code></pre> <p>References:</p> <p><a href="https://github.com/rails/rails/blob/2a371368c91789a4d689d6a84eb20b238c37678a/activesupport/lib/active_support/core_ext/object/blank.rb#L57" rel="noreferrer">https://github.com/rails/rails/blob/2a371368c91789a4d689d6a84eb20b238c37678a/activesupport/lib/active_support/core_ext/object/blank.rb#L57</a> <a href="https://github.com/rails/rails/blob/2a371368c91789a4d689d6a84eb20b238c37678a/activesupport/lib/active_support/core_ext/object/blank.rb#L67" rel="noreferrer">https://github.com/rails/rails/blob/2a371368c91789a4d689d6a84eb20b238c37678a/activesupport/lib/active_support/core_ext/object/blank.rb#L67</a> <a href="https://github.com/rails/rails/blob/2a371368c91789a4d689d6a84eb20b238c37678a/activesupport/lib/active_support/core_ext/object/blank.rb#L14" rel="noreferrer">https://github.com/rails/rails/blob/2a371368c91789a4d689d6a84eb20b238c37678a/activesupport/lib/active_support/core_ext/object/blank.rb#L14</a> <a href="https://github.com/rails/rails/blob/2a371368c91789a4d689d6a84eb20b238c37678a/activesupport/lib/active_support/core_ext/object/blank.rb#L47" rel="noreferrer">https://github.com/rails/rails/blob/2a371368c91789a4d689d6a84eb20b238c37678a/activesupport/lib/active_support/core_ext/object/blank.rb#L47</a></p> <p>And here is the <code>String.blank?</code> implementation which should be more efficient than the previous one:</p> <p><a href="https://github.com/rails/rails/blob/2a371368c91789a4d689d6a84eb20b238c37678a/activesupport/lib/active_support/core_ext/object/blank.rb#L101" rel="noreferrer">https://github.com/rails/rails/blob/2a371368c91789a4d689d6a84eb20b238c37678a/activesupport/lib/active_support/core_ext/object/blank.rb#L101</a></p>

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