class RuboCop::Cop::Style::StringMethods

from the String class.
This cop enforces the use of consistent method names

def autocorrect(node) 

def autocorrect(node)
  lambda do |corrector|
    corrector.replace(node.loc.selector,
                      preferred_method(node.loc.selector.source))
  end
end

def on_send(node) 

def on_send(node)
  _receiver, method_name, *_args = *node
  return unless preferred_methods[method_name]
  add_offense(node, :selector,
              format(MSG, preferred_method(method_name), method_name))
end