From: Trans <transfire@...>
Date: 2007-12-20T00:42:28+09:00
Subject: Re: Hash#collate



On Dec 19, 9:32 am, Nobuyoshi Nakada <n...@ruby-lang.org> wrote:
> Hi,
>
> At Wed, 19 Dec 2007 09:05:11 +0900,
> Phrogz wrote in [ruby-talk:284104]:
>
> > I wanted a method like Hash#update, but that preserved the values from
> > both the original and argument Hash. A little searching failed to find
> > it. (I did find that someone somewhere wrote a Hash#collate that's in
> > my ri docs, but who knows where it came from. Its description appears
> > not to do at all what I wanted, anyhow.)
>
> {:a=>1, :b=>2 }.update(:a=>3, :b=>4, :c=>5) {|key, *values| values}

Woh! Little known is this karate!

You can even do:

  {:a=>1, :b=>2 }.update(:a=>[1,3], :b=>4, :c=>5) {|key, *values|
values.flatten.uniq}
  => {:a=>[1, 3], :b=>[2, 4], :c=>5}

T.