Five lines that turn Ruby into a different language

gistfile1.rb

class Object
  def method_missing m, *args
    Object.respond_to?(m, true) ? Object.send(m, self, *args) : super
  end
end

Question by @solojavier: What is this about? Newbie in ruby. (I had the same question, in my mind! - A Ruby Enthusiast)

Explanation given by @michaelfeathers: It allows you to chain functions onto arbitrary objects. Each function that you use in this style is understood to accept the return value of the previous link in the chain as its first argument. I know that is abstract, but here is a code example:

def plus array, n
  array.map { |x| x + n }
end

[1,2,3].plus(1).plus(2) == [4,5,6]

ArrayMac: A language is a set of conventions around expression. The term DSL (Domain-Specific Language) uses the word 'language' in this sense.

@michaelfeathers tweeted the gist as "Five lines that turn Ruby into a different language". I guess, by language he meant DSL.