如何更改每种方法的值？

Question

从这段代码中，我想到最后一行：puts computer_number返回3。

但现在是5。

我该怎么做？

def find_at_risk_square(square, computer_number)
  WIN.each do |n|
    array = []
    n.each do |k|
      array << square[k]
    end
    if array.count("X") == 2
      computer_number = array.index(" ") + 1
    end
  end
end

WIN = [[1, 2, 3],
       [4, 5, 6],
       [7, 8, 9],
       [1, 4, 7],
       [2, 5, 8],
       [3, 6, 9],
       [1, 5, 9],
       [3, 5, 7]].freeze

square = {1=>"X",2=>"X",3=>" ",4=>" ",5=>" ",6=>" "}
computer_number = "5"
find_at_risk_square(square, computer_number)
puts computer_number

Answer 1

您可以更改.each循环中的值。您无法从类似的方法返回值。

当您在方法中执行computer_number = array.index(" ") + 1时，您将分配方法本地变量。这不会影响外部世界，无论是否采用.each方法。