无法使用yield获得所需的输出

Question

我想使用ablock打印值5，如下所示。我尝试使用ablock {|x, y| puts "answer:#{x+2*y}"}。但它没有在irb中显示任何内容。

def ablock
  i = 1
  j = 2
  yield(i, j)
  i = 3
  j = 4
end

Answer 1

它应该可以正常工作

2.1.1 :001 > def ablock
2.1.1 :002?>     i = 1
2.1.1 :003?>     j = 2
2.1.1 :004?>     yield(i, j)
2.1.1 :005?>     i = 3
2.1.1 :006?>     j = 4
2.1.1 :007?>   end
 => :ablock 
2.1.1 :008 > ablock {|x, y| puts "answer:#{x+2*y}"}
answer:5
 => 4 
2.1.1 :009 >