From: Joel VanderWerf <joelvanderwerf@...>
Date: 2010-08-05T05:16:36+09:00
Subject: Re: A little problem

Amir Ebrahimifard wrote:
> Hi
> What is difference between these 2 codes ?
> (when I executed these codes result was the same )
> 
> ---------------------
> def welcome1( name )
>  puts "Hello#{name}"
> end
> 
> def welcome2( name )
>  puts "Hello"+name
> end
> 
> welcome1( Amir )
> welcome2( Amir )
> 
> ---------------------

The first calls #to_s and the second calls #to_str. The #to_str method 
is usually only defined for objects that are already String-like. The 
#to_s is usually defined for everything.

def welcome1( name )
  puts "Hello#{name}"
end

def welcome2( name )
  puts "Hello"+name
end

Amir = Object.new

def Amir.to_s
   puts "to_s"
   "Amir"
end

def Amir.to_str
   puts "to_str"
   "Amir"
end

welcome1( Amir )
welcome2( Amir )