修改实例变量的名称

Question

假设我有@chicken，但我想通过计数循环将其重命名为@ chicken1和@ chicken2。一旦我用"chicken#{@count}"之类的东西生成名称，我该如何将输出变成类似@ chicken1等的输出？

Answer 1

Ruby有这样的任务的方法remove_instance_variable

class A 
    def initialize 
    @chicken = 'chichen' 
    end 

    def rename 
    count = 1 
    instance_variable_set(:"@chicken#{count}", @chicken) 
    end 

    def remove 
    remove_instance_variable(:@chicken) 
    end 
end 

a = A.new 

a.instance_variables #=> [:@chicken] 

a.rename 

a.instance_variables #=> [:@chicken, :@chicken1] 

a.remove 

a.instance_variables #=> [:@chicken1] 

a.instance_variable_get("@chicken1") #=> "chicken"