Ruby 为什么这个“聋奶奶”节目不正确？

此代码将根据整个字符串是否大写返回正确的短语

response = ''

while response != "BYE"
    puts "What would you like deary?"
    response = gets.chomp
    if response = response.downcase
        puts "speak up!"
    else
        puts "I can hear you!"
    end
    response = gets.chomp
end

但是，无论输入的字符串是全小写还是全大写，此代码始终返回speak up：

puts "What would you like deary?"
response = gets.chomp

while response != "BYE"
    if response = response.downcase
        puts "speak up!"
    else
        puts "I can hear you!"
    end
    response = gets.chomp
end

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我有点搞不懂为什么会这样

看起来您想测试等式==，而不是执行赋值=：

---

看起来您想要测试等式==，而不是执行赋值=：

if response == response.downcase