From: Rick DeNatale <rick.denatale@...>
Date: 2007-05-06T08:19:21+09:00
Subject: Re: Noob Concatenation Q?

On 5/4/07, Marcin Miel�y�ski <lopx@gazeta.pl> wrote:> jervis@o2.ie wrote:> > Can someone briefly explain why ::> > puts i.to_s +" :: "+arrayoutput[i]> >> > yaml.rb:12: undefined method `+@' for " :: ":String (NoMethodError)> >         from F:/RUBY/Source/yaml.rb:11:in `times'> >         from F:/RUBY/Source/yaml.rb:11> >>> because parens in Ruby are optional, so it ends up:>> puts i.to_s(+" :: "+arrayoutput[i])
Correct and then the + in  +"::"
is being interpreted by the parser as a unary + which it implements bysending the message :+@ to the string "::".
$ qri +@------------------------------------------------------------- Numeric#+@     +num    => num------------------------------------------------------------------------     Unary Plus---Returns the receiver's value.

-- Rick DeNatale
My blog on Rubyhttp://talklikeaduck.denhaven2.com/