From: Brian Wisti <brianwisti@...>
Date: 2004-09-17T10:40:46+09:00
Subject: Re: Ex-Perl coders: Howz it feel to convert to Ruby?


--- "David A. Black" <dblack@wobblini.net> wrote:

> Hi --
> 
> On Fri, 17 Sep 2004, Brian Wisti wrote:
> 
> > 
> > --- Nate Smith <nsmith5@nist.gov> wrote:
> > 
> > > Try
> > > 
> > > print "a" + 1
> > > 
> > > Won't work -- you have to do
> > > 
> > > print "a" + 1.to_s
> > > 
> > > 
> > > Nate
> > 
> > That "+" means you're building a new string from two Strings. Since
> the
> > second operand is not a String, the conversion has to be explicit.
> 
> If the second operand responds to to_str, then its response to to_str
> will be used in cases where only a string will do:
> 
>   irb(main):016:0> obj = Object.new
>   => #<Object:0x402a6e94>
>   irb(main):017:0> puts "this is an " + obj
>   TypeError: cannot convert Object into String
>           from (irb):17:in `+'
>           from (irb):17
>           from :0
>   irb(main):018:0> def obj.to_str; "implicit string representation!";
>   end
>   => nil
>   irb(main):019:0> puts "this is an " + obj
>   this is an implicit string representation!
> 
> 
> David
> 
> -- 
> David A. Black
> dblack@wobblini.net

So we just have Fixnums and similar types not responding to to_s?
Interesting...

-- Brian Wisti