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taiki45/play_with_ruby.rb

Created November 9, 2012 13:40
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fun! ruby!
Raw
play_with_ruby.rb
fact = lambda {
|pr, x| x * pr.((x - 1), pr)
}.curry.(lambda {|x, pr| x <= 0 ? 1 : x * pr.((x - 1), pr) })
a = Class.new.instance_exec(fact) do |fact|
define_method(:fact, fact)
self
end.new
p a.fact 5
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