From: Shannon Fang <xrfang@...>
Date: 2005-10-25T13:38:06+09:00
Subject: Re: RCR: Array#to_h

The block may be useful because you may want to, for example, do some 
calculation, or even lookup the database...

Shannon


>From: "Marcel Molina Jr." <marcel@vernix.org>
>Reply-To: ruby-talk@ruby-lang.org
>To: ruby-talk@ruby-lang.org (ruby-talk ML)
>Subject: Re: RCR: Array#to_h
>Date: Tue, 25 Oct 2005 12:16:04 +0900
>
>On Tue, Oct 25, 2005 at 12:10:18PM +0900, Shannon Fang wrote:
> > Abstract
> >
> > A simple method that construct a hash from an array. Just like Hash#to_a
> > return an array from hash.
>
>Having your proposed to_h accept a block is a nice idea but as it is you 
>can
>do the non-block version quite easily:
>
> >> Hash[*%w(a b c d)]
>=> {"a"=>"b", "c"=>"d"}
> >> keys = %w(a b c d)
>=> ["a", "b", "c", "d"]
> >> values = [1, 2, 3, 4]
>=> [1, 2, 3, 4]
> >> Hash[*keys.zip(values).flatten]
>=> {"a"=>1, "b"=>2, "c"=>3, "d"=>4}
>
>marcel
>--
>Marcel Molina Jr. <marcel@vernix.org>
>