无法使用收益率获得所需的输出

Question

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

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

Answer 1

它应该工作的罚款

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 >