From: Greg Hauptmann <greg.hauptmann.ruby@...>
Date: 2008-10-27T12:47:57+09:00
Subject: Re: Hash.merge_add! extension - how does this code look?

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thanks for highlighting this!  Is the quickest way to normalise to Array via
the following?
    hashitem.instance_of?(Array) ? hashitem : [hashitem]



On Mon, Oct 27, 2008 at 7:45 AM, Stefan Rusterholz <apeiros@gmx.net> wrote:

> Greg Hauptmann wrote:
> > Hi, I wanted a way to be able to "add" values to a Hash such that it
> > keeps  the old and the new values.  For examples example adding
> > an item to a hash for which the keys are dates.   Here's a first cut.
> >  Any feedback on coding style etc?
>
> Reading your problem and code I think you missed that Hash#merge
> optionally takes a block which seems to solve your issue just fine but
> in a more generic manner:
>
> hash = {'foo' => 'bar1'}
> hash.merge! 'foo' => 'bar2' do |key, existing, new|
>  Array(existing) + [new]
> end
> p hash # -> {"foo"=>["bar1", "bar2"]}
>
> Additionally I would normalize all values to arrays upfront here, makes
> dealing with the hash a lot easier.
>
> Regards
> Stefan
> --
> Posted via http://www.ruby-forum.com/.
>
>

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