How to require a block in Ruby?

ruby

Solution

Simply by using `yield`.

If you include `yield` in a method, and a block is not given, it throws an error.

Put this in a file and run it:

def needs_block
    yield
end

needs_block

It will throw an error like this:

LocalJumpError: no block given
    from (irb):14:in `needs_block'
    from (irb):16

Problem

Is there any built in way to require that a block be passed to a Ruby method? I realize I can just raise an exception if `block_given?` is false, but is there some nicer way to do it?

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