Are there better ways to prevent 'yield' when no block is passed in?

问题

I have a method that yields, which looks like:

def a_method(*params)
  # do something
  yield
  # do something else
end

I want this method to yield the block if a block is passed in; and if no block is passed in, the method should sliently skip the yield sentense without crashing with something like:

 no block given (yield) (LocalJumpError)

Of course, the most straightforward way is changing the method to:

def a_method(*params, &block)
  # do something
  yield if block
  # do something else
end

But aren't there prettier ways?

回答1:

Yes! :)

def a_method(*params)
  # ...
  yield if block_given?
  # ...
end

来源：https://stackoverflow.com/questions/7061266/are-there-better-ways-to-prevent-yield-when-no-block-is-passed-in