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Groups > comp.lang.ruby > #5094

Re: Method that mutates object

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On 5/26/2011 11:07, jay s. wrote:
> I understand that using String#replace works for the String class, but 
> what if you were writing a random method for Integer that takes a number 
> and sets it equal to some other number.
> 
> Ex.
> 
> x = 7
> 
> class Integer
>   def crazy
>     ...set x to 5...
>   end
> end
> 
> 
> now when you call x the value is 5

Instances of Integer are immutable, so you can't do that.  The
documentation for Fixnum (a descendant of Integer) mentions this in the
Overview section:

http://rdoc.info/stdlib/core/1.9.2/Fixnum

-Jeremy

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Method that mutates object jason solomon <solomon.jas@gmail.com> - 2011-05-25 14:22 -0500
  Re: Method that mutates object Stefano Crocco <stefano.crocco@alice.it> - 2011-05-25 14:28 -0500
    Re: Method that mutates object jason solomon <solomon.jas@gmail.com> - 2011-05-25 15:52 -0500
  Re: Method that mutates object Adam Prescott <adam@aprescott.com> - 2011-05-25 14:31 -0500
  Re: Method that mutates object Quintus <sutniuq@gmx.net> - 2011-05-25 15:45 -0500
    Re: Method that mutates object jason solomon <solomon.jas@gmail.com> - 2011-05-25 16:03 -0500
  Re: Method that mutates object jason solomon <solomon.jas@gmail.com> - 2011-05-25 15:59 -0500
    Re: Method that mutates object Brian Candler <b.candler@pobox.com> - 2011-05-25 16:20 -0500
  Re: Method that mutates object "jay s." <solomon.jas@gmail.com> - 2011-05-25 16:36 -0500
    Re: Method that mutates object 7stud -- <bbxx789_05ss@yahoo.com> - 2011-05-25 17:00 -0500
  Re: Method that mutates object "jay s." <solomon.jas@gmail.com> - 2011-05-26 08:56 -0500
    Re: Method that mutates object Jeremy Bopp <jeremy@bopp.net> - 2011-05-26 09:43 -0500
      Re: Method that mutates object "jay s." <solomon.jas@gmail.com> - 2011-05-26 10:00 -0500
        Re: Method that mutates object Josh Cheek <josh.cheek@gmail.com> - 2011-05-26 13:12 -0500
  Re: Method that mutates object "jay s." <solomon.jas@gmail.com> - 2011-05-26 10:55 -0500
  Re: Method that mutates object "jay s." <solomon.jas@gmail.com> - 2011-05-26 11:07 -0500
    Re: Method that mutates object Jeremy Bopp <jeremy@bopp.net> - 2011-05-26 11:14 -0500
      Re: Method that mutates object "jay s." <solomon.jas@gmail.com> - 2011-05-26 11:30 -0500
    Re: Method that mutates object Gary Wright <gwtmp01@mac.com> - 2011-05-26 16:34 -0500
      Re: Method that mutates object Adam Prescott <adam@aprescott.com> - 2011-05-27 10:57 -0500
      Re: Method that mutates object Christopher Dicely <cmdicely@gmail.com> - 2011-05-28 13:05 -0500
        Re: Method that mutates object Gary Wright <gwtmp01@mac.com> - 2011-05-28 19:29 -0500
          Re: Method that mutates object Gary Wright <gwtmp01@mac.com> - 2011-05-28 21:06 -0500

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