block_fun.rb

# Use all examples to output the string "Hello, Sven!"

def hello_0(&block)
  puts yield
end

def hello_1(&block)
  puts block.call
end

def hello_2(name, &block)
  puts block.call(name)
end

class Hello3
  def initialize(name)
    @name = name
  end

  def call(&block)
    puts self.instance_exec(&block)
  end
end