檢查是否認義了變量? - Checking if a variable is defined?

問題:

How can I check whether a variable is defined in Ruby? 如何檢查Ruby中是否認義了變量? Is there an isset -type method available? 是否有isset type方法? spa


解決方案:

參考一: https://stackoom.com/question/1D6h/檢查是否認義了變量
參考二: https://oldbug.net/q/1D6h/Checking-if-a-variable-is-defined
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