From: Morton Goldberg <m_goldberg@...>
Date: 2006-07-30T02:30:29+09:00
Subject: Re: to_i vs. to_int

On Jul 29, 2006, at 12:58 PM, dblack@wobblini.net wrote:

> What's a use case for to_int?  I was thinking of this classic to_str
> example:
>
>   class S
>     def to_str
>       "some text"
>     end
>   end
>
>   puts "Here is " + S.new   # Here is some text
>
> But the to_int equivalent doesn't work:
>
>   class S
>     def to_int
>       2
>     end
>   end
>
>   puts 2 + S.new    # TypeError: S can't be coerced into Fixnum
>
> Same thing with:
>
>   puts Integer(2) + S.new
>
> I'm stuck trying to find a case where to_int does what to_str does --
> but maybe it doesn't.

However,

    puts 2 + Integer(S.new) => 4

uses your S#to_int

Regards, Morton