cubicool

module ExtraMethods                                                                                               
  def def_foo                                                                                                     
    # b = binding                                                                                                 
    # NOTE: The binding acquired here always belongs to ExtraMethods, NOT to                                      
    # SomeClass, which is what I actually want.                                                                   
  end                                                                                                             
  
  module_function :def_foo                                                                                        
end                                                                                                             

cubicool

vals = { foo: 1, bar: 2, baz: 3 }

# Good!
puts vals.map { |k, v| "#{k}=#{v}" }.join ' '

# Bad!
puts vals.map do |k, v|
  "#{k}=#{v}"
end.join ' '