ruby - String interpolation update after change -

i have values in interpolated string refer array this:

attr_accessor :s, :gamespace  def initialize   @s = [1,2,3]   @gamespace = "#{@s[0]} | #{@s[1]} | #{@s[2]} " end 

when change value of @s, doesn't update value of @gamespace.

i resorted making additional method this:

def gamespace   @gamespace = "#{@s[0]} | #{@s[1]} | #{@s[2]}" end 

and call after change @s.

is there way let attr_accessor update string interpolation after change without writing method?

a reader method refers instance variable, doesn't re-evaluate it. if want use reader method updated value, thing can not use default setter method, write own.

def s=   @s =   @gamespace = "#{a[0]} | #{a[1]} | #{a[2]} " end 

setting @a should not done directly, should done through s=. applies initialize well:

def initialize; s=([1, 2, 3]) end