class RuboCop::Cop::Performance::OpenStruct

This cop checks for `OpenStruct.new` calls. Instantiation of an `OpenStruct` invalidates Ruby global method cache as it causes dynamic method definition during program runtime. This could have an effect on performance, especially in case of single-threaded applications with multiple `OpenStruct` instantiations.

@example

# bad
class MyClass
  def my_method
    OpenStruct.new(my_key1: 'my_value1', my_key2: 'my_value2')
  end
end

# good
class MyClass
  MyStruct = Struct.new(:my_key1, :my_key2)
  def my_method
    MyStruct.new('my_value1', 'my_value2')
  end
end

Constants

MSG
RESTRICT_ON_SEND

Public Instance Methods

on_send(node) click to toggle source
# File lib/rubocop/cop/performance/open_struct.rb, line 39
def on_send(node)
  open_struct(node) do
    add_offense(node.loc.selector)
  end
end