Array.include？ myVariable无法按预期工作

我正在编写一个Ruby 1.9脚本，我遇到了一些使用.include?问题.include? 方法与数组。

这是我的整个代码块：

planTypes = ['C','R','S'];
invalidPlan = true;
myPlan = '';


while invalidPlan  do
    print "Enter the plan type (C-Commercial, R-Residential, S-Student): ";
    myPlan = gets().upcase;
    if planTypes.include? myPlan
        invalidPlan = false;
    end
end

为了解决问题，我添加了打印语句：

while invalidPlan  do
    print "Enter the plan type (C-Commercial, R-Residential, S-Student): ";
    myPlan = gets().upcase;
    puts myPlan;                        # What is my input value? S
    puts planTypes.include? myPlan      # What is the boolean return? False
    puts planTypes.include? "S"         # What happens when hard coded? True
    if planTypes.include? myPlan
        puts "My plan is found!";       # Do I make it inside the if clause? Nope
        invalidPlan = false;
    end
end

由于我用硬编码的字符串得到了正确的结果，我尝试了"#{myPlan}"和myPlan.to_s 。 但是我仍然得到一个false结果。

我是Ruby脚本编程的新手，所以我在猜测我错过了一些明显的东西，但是在查看这里和这里的类似问题以及检查Ruby Doc之后，我不知道它的行为是否正确。

---

结果gets包括换行符（ n ），你可以看到，如果你打印myPlan.inspect ：

Enter the plan type (C-Commercial, R-Residential, S-Student): C
"Cn"

添加strip以清除不需要的空白：

myPlan = gets().upcase.strip;

Enter the plan type (C-Commercial, R-Residential, S-Student): C
"C"

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