Method: Hash#to_class_attr

Defined in:
lib/html_attributes/hash.rb

#to_class_attr ⇒ Object

Returns a string containing the class names whose conditions are neighter false nor nil, or returns nil if no class names remains.

Examples

{ :first => true, :second => false, :third => true }.to_class_attr
# => "first third"

{ :foo => false, :bar => false }.to_class_attr
# => nil



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# File 'lib/html_attributes/hash.rb', line 14

def to_class_attr
  self.select { |klass, condition| condition }.           # remove classes with nil or false condition
       map { |elem| elem.first.to_s }.                    # throw condition away
       sort.                                              # sort alphabetically
       to_class_attr                                      # join with ' ' or return nil if empty
end