safe.rb

attribute_names.map do |attribute_name|
  attribute(attribute_name)
end.join.html_safe

# vs.

"".html_safe.tap do |attributes|
  attribute_names.each do |attribute_name|
    attributes.safe_concat attribute(attribute_name)
  end
end

# vs

@template.safe_join(attribute_names.map do |attribute_name|
  attribute(attribute_name)
end)

# vs

attribute_names.map do |attribute_name|
  attribute(attribute_name)
end.inject(:safe_concat)