From: Rasputin <rasputin@...>
Date: 2003-05-31T01:06:49+09:00
Subject: Re: to_s and concatenation

* ts <decoux@moulon.inra.fr> [030530 14:52]:
> >>>>> "R" == Rasputin  <rasputin@shrike.mine.nu> writes:
> 
> R> irb(main):010:0> puts "foo" + Wtf.new
> R> TypeError: failed to convert Wtf into String
> 
>  String#+ want an object which respond to #to_str

Right, but when do you use one and when the other?
Pickaxe says:

  to_str     	 str.to_str -> str
	

Synonym for String#to_s . to_str is used by methods such as
String#concat to convert their arguments to a string. Unlike to_s, which
is supported by almost all classes, to_str is normally implemented only
by those classes that act like strings. Of the built-in classes, only
Exception and String implement to_str.


supports what you just said (although the 'synonym for' sentence is a
bit misleading), but what else would you use to_s for but to
print to stdout?

I know this is probably basic stuff, but there doesn't seem to be
anywhere else to ask...

-- 
Rasputin :: Jack of All Trades - Master of Nuns