用链式调用替换临时变量
before
class MovieQue
def movies
@movies ||= []
end
def add_movie(title)
movies << title
end
end
rental = MovieQue.new
rental.add_movie("Shawshank Redemption")
rental.add_movie("Flight of the Navigator")
rental.add_movie("Happy Gilmore")
after
class MovieQue
def self.with_movie(title)
rental = self.new
rental.movies << title
rental
end
def movies
@movies ||= []
end
def and(title)
movies << title
self
end
end
