从代表局部变量的字符串中获取值 [英] Get value from string representing local variable

问题描述

我有一个本地变量名称作为字符串，并且需要获取其值.

I have a local variable name as a string, and need to get its value.

variable = 22
"variable".to_variable?

如何从字符串中获取值22?

How can I get the value 22 form the string?

推荐答案

您可以使用eval.

variable = 22
eval("variable")
# => 22 

但是 eval可能令人讨厌.如果您不介意声明实例变量，也可以执行以下操作:

However eval can be nasty. If you dont mind declaring an instance variable, you can do something like this too:

@variable = 22
str = "variable"
instance_variable_get("@#{str}")
# => 22

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