From: vannuys@...
Date: 2008-04-25T03:50:14+09:00
Subject: Re: Function appends same value to string based on number of function 	calls

On Apr 24, 11:35 am, vann...@gmail.com wrote:
> On Apr 24, 11:11 am, Rob Biedenharn <R...@AgileConsultingLLC.com>
> wrote:
>
>
>
> > On Apr 24, 2008, at 2:00 PM, vann...@gmail.com wrote:
>
> > > Hi Guys,
>
> > > Is this default ruby behaviour or is this a bug? Based on the number
> > > of call to Testappend::get_some_value, the string "-New Value" is
> > > appended x number of times. If you first assign value = '' instead of
> > > value = @text, the behaviour is different and the "-New Value" string
> > > is appended only once.
>
> > Do you mean:
> >     def get_some_value
> >       value = ''
> >       value << '-New Value'
> >       return value
> >     end
>
> > If so, where do you do anything with the String object to which @text
> > refers?
>
> > BTW, you could simplify your original to just:
> >     def get_some_value
> >       @text << '-New Value'
> >     end
>
> > -Rob
>
> > Rob Biedenharn          http://agileconsultingllc.com
> > R...@AgileConsultingLLC.com
>
> > > version of ruby: ruby 1.8.6 (2007-03-13 patchlevel 0) [x86_64-linux]
>
> > > Thanks.
>
> > > Philippe
>
> > > -----------------------------------------------------
>
> > > module ATest
>
> > >  def ATest.main
>
> > >    t = TestAppend.new
> > >    puts t.get_some_value ==> Start of string-New Value
> > >    puts t.get_some_value ==> Start of string-New Value-New Value
> > >    puts t.get_some_value ==> Start of string-New Value-New Value-New
> > > Value
>
> > >  end
>
> > >  class TestAppend
> > >    attr_accessor :text
>
> > >    def initialize(attributes = {})
> > >      @text = "Start of string"
> > >    end
>
> > >    def get_some_value
> > >      value = @text
> > >      value << '-New Value'
> > >      return value
> > >    end
>
> > >  end
>
> > > end
>
> > > ATest::main
>
> Rob,
>
> I do not want to assign a new value to @text.
> The "get_some_value" function should return a new string (value) which
> is a concatenation of strings. In this case a simple concatenation of
> @text and "-New Value".
>
> #This version will work and does not append "-New Value" x times based
> on the number of function calls.
> def get_some_value
>        value = ''
>        value = @text
>        value << '-New Value'
>        return value
> end
>
> Thank you for your help,
>
> Philippe

Sorry, this works, the second line is << instead of =

def get_some_value
  value = ''
  value << @text
  value << '-New Value'
  return value
end

Philippe