osyo-manga https://blog.hatena.ne.jp/osyo-manga/ Secret Garden(Instrumental) https://secret-garden.hatenablog.com/ Ruby Ruby でフィボナッチ数列を求めるメタプログラミングを書いてみた。 class Fib def call n __send__ "_#{n}" end def method_missing name, *args n = name[/_(\d+)/, 1].to_i if n > 1 n = call(n - 2) + call(n - 1) end define_singleton_method(name) { n } && n end end fib = Fib.new 1.upto(55) do |n| print "#{fib.call n} " end # => 1 1 2 3 5… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fsecret-garden.hatenablog.com%2Fentry%2F2016%2F02%2F20%2F222316" title="Ruby でメタプログラミング的にフィボナッチ数列を求める - Secret Garden(Instrumental)" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2016-02-20 22:23:16 rich https://secret-garden.hatenablog.com/entry/2016/02/20/222316 1.0 100%