From: Trans <transfire@...>
Date: 2006-08-17T23:55:09+09:00
Subject: Re: Multiple arguments for Hash#delete


Daniel Schierbeck wrote:
> nobu@ruby-lang.org wrote:
> > Hi,
> >
> > At Thu, 17 Aug 2006 04:05:08 +0900,
> > Daniel Schierbeck wrote in [ruby-talk:208833]:
> >> Probably somewhat slower, but hey, it lets you do this
> >>
> >>    a, b, c = hsh.delete :a, :b, :c
> >
> > What will be returned from `hsh.delete :a'?
>
> The value of :a
>
>    hsh = {:a => 1, :b => 2, :c => 3}
>    hsh.delete :a, :b  #=> [1, 2]
>    hsh.delete :c      #=> 3
>
> that way, you can do this
>
>    a    = hsh.delete :a
>    b, c = hsh.delete :b, :c
>
> Cool, right?

Ah,  Nobu has a good point. It's beeter to have same kind of output. He
also jogs my memory. Array has #delete_values_at and that's what we
need for Hash too.

 def delete_values_at(*keys, &block)
    keys.map{|key| delete(key, &block) }
  end

Kind of long name though, maybe #delete_at would suffice?

T.