From: come <come.news@...>
Date: 2007-08-25T07:45:04+09:00
Subject: Re: Changing "self" for cleaner code

Thanks for your anwser.
I knew I could write the form "File.open(...) do |x| ... end". I read
nearly all books on Ruby/Rails right now ;-). The last I'm reading is
"Practical Ruby for System Administration", Apress. A good book, too.
I was surprised.
But I cant't practice as often as I would, so I miss some automatism.

I was asking myself if i couldn't write something like :

with my_object do something end

instead of :

with my_object do |o| o.something end

I found it would be a little bit cleaner to write like that. The first
answer gave me an answer : I can define "with" myself.

Come

On 23 aug, 21:34, Robert Klemme <shortcut...@googlemail.com> wrote:
> On 23.08.2007 12:24, come wrote:
>
> > Yes !
> > I didn't think about using instance_eval this way and define my own
> > "with" method... I'm still not confortable with metaprogramming ;-)
>
> You don't need to.  You can simply use instance_eval directly:
>
> File.open("foo", "w") do |x|
>    x.instance_eval do
>      puts "hello"
>    end
> end
>
> Although I have to say I find this a bit clumsy.  I'd prefer
>
> File.open("foo", "w") do |io|
>    io.puts "hello"
> end
>
> Even if there were more IO operations I had to do on "io".  The piece
> above could be easily confused with printing to $defout.  Just my 0.02EUR...
>
> Kind regards
>
>         robert