Question

I have already wrote a class in ruby, call it Foo. Now I want to create some instance of it. However, I want to use the value stored in a variable as the name of the instance.

For example, the value of a variable bar is “ABC”. Now I want to make the name of the new instance “ABC” as the statement ABC = Foo.new

Can I realize this? If it is possible, please tell me how. Thanks!!!

Answer 1

In Ruby, you should also not be afraid to use eval(), as long as you feed it only data constructed by you, the programmer, without unsafe external influence. In this case,

cocos = "ABC"
class_sym = :Foo
eval "#{cocos} = #{class_sym}.new"

Eval has bad reputation in many languages, but in Ruby, its quite comfortable and basically as fast as static code.