From: new2ruby@... (New 2 Ruby)
Date: 2005-10-25T06:22:02+09:00
Subject: Re: [SORT?] by x,y allowing x,y to be passed as parms

On Sun, 23 Oct 2005 19:02:37 -0600, "Ara.T.Howard"
<Ara.T.Howard@noaa.gov> wrote:

>On Mon, 24 Oct 2005, New 2 Ruby wrote:
>
>> Have  class  CD with several fields defined,
>> @list_of_CDs array in class  CD_List holding CD pointers,
>> and a couple of methods to sort array of pointers by any two fields.
>>
>     def initialize hash
>       hash.each{|k,v| send "#{ k }=", v}
>     end
>     def inspect
>       'cd(' << ATTRIBUTES.map{|k| [k,send(k)].join('=')}.join(', ') << ')'
>     end

>   class CDList < ::Array
>     def sorted_by *keys
>       block = lambda{|cd| keys.flatten.map{|k| cd.send k}}
>       sort_by &block

Thanks Ara.  Yes, that will sort on one or more of the
attributes of CD.  Now, will work on understanding how it does it.

Jim

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