blocks_are_procs.rb

class BlocksAreProcs
  def try_to_invoke_block
    foo do
      puts "start here"
      return
    end
  end

  def foo
    yield
    puts "i will never get here"
  end
end

class ProcsAreProcs
  def try_to_invoke_block
    myproc = Proc.new do
      puts "start here"
      return
    end

    foo(&myproc)
  end

  def foo(&block)
    block.call
    puts "i will never get here"
  end
end

class Lambdas
  def try_to_invoke_block
    mylambda = lambda do
      puts "start here"
      return
    end

    foo(&mylambda)
  end

  def foo(&block)
    block.call
    puts "i will get here, just fine, thanks!"
  end
end