Rubyのブロックのメモ

(Ruby1.9.3)

def foo(a)
  yield a
end
puts foo(10) {|x| x * 2}
# >> 20

def bar(option)
  yield option
end
puts bar(a: 2, b: 3) { |o| o[:a] + o[:b] + 10 }
# >> 15