From: Harry Kakueki <list.push@...>
Date: 2007-06-05T21:33:00+09:00
Subject: Re: Writing method "change!" for String

On 6/5/07, Mike <michaelst@gmail.com> wrote:
> Hi,
>
>    I'm trying to write simple method to change internal value of
> String class:
>
> class String
>     def change!
>         self="0" if self.downcase=="myvalue1"
>         self="1" if self.downcase=="myvalue2"
>         self
>     end
> end
>
> test="myvalue1"
> test.change!
> p test
>
> It should just change value of string to what I want. But I get error:
> "Can't change the value of self".
> How do I proceed?
>
> Thanks.
>
>
>
Do not try to change self.

Try this.

class String
   def change!
       val="0" if self.downcase=="myvalue1"
       val="1" if self.downcase=="myvalue2"
       val
   end
end

test="myvalue1"
p test.change!
p test

Harry

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