修改實例變量的名稱

Question

假設我有@chicken，但我想通過計數循環將其重命名爲@ chicken1和@ chicken2。一旦我用"chicken#{@count}"之類的東西生成名稱，我該如何將輸出變成類似@ chicken1等的輸出？

Answer 1

Ruby有這樣的任務的方法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"