From: Christopher Swasey <christopher.swasey@...>
Date: 2008-02-20T07:29:50+09:00
Subject: Re: ||= [] idiom

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On 2/19/08, Leslie Viljoen <leslieviljoen@gmail.com> wrote:
>
> I often make use of this idiom to add something to an array in a hash of
> arrays:
>
> @categories = {}
>
> pagelist.each do |resource|
>     @categories[resource.tag] ||= []
>     @categories[resource.tag] << resource
> end
>
>
> .. is there a better way? Can the two @categories lines
> be made into one?


@categories = {}

pagelist.each do |resource|
  (@catetegories[resource.tag] ||= []) << resource
end



Christopher

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