From: Dark Ambient <sambient@...>
Date: 2006-07-12T03:18:07+09:00
Subject: Re: blocks and procs

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Good example.  Also because it's rails centric (something I'd eventually
like to get to)
I am running into some select errors though , via the select statement.  If
your up to reading it through (I don't find any typos matched against your
code), if not that is fine as the explanation helped me.

class ClientDB
  Record = Struct.new(:client_name, :location, :projects)

  def initialize
    @records = [ Record.new("Gray Productions", "Oklahoma",
                      ["Ruby Quiz", "Rails Extensions"] ),
                      Record.new( "Serenity Crew", "Deep Space",
                      ["Ship Enhancements"] ),
                      Record.new( "Neo", "Hollywood",
                      ["Rails interface for the Matrix"] ) ]
                    end # end of method

    def select( query )
      # parse query String
      rules = Hash[*query.split(/\s*AND\s*/).map do |rule|
        rule.split(/\s*=\s*/).map { |value| value.sub(/^['"](.+)['"]$/,
'\1') }
        end.flatten ]

      #match records
      @records.select { |record| block_given? and yield record }
        rules.all? { |field, value| record.send(field) == value }


    end # end of method

end # end of class

  require "pp"
  db = ClientDB.new
  pp db.select { |record| record.client_name != "Gray Productions" }
  pp db.select { |record| record.client_name +~ /crew/i }
  pp db.select { |record| record.projects.size == 1 }
  pp db.select { |record| record.projects.include? "Ruby Quiz" }

--------

On 7/11/06, James Edward Gray II <james@grayproductions.net> wrote:
>
> On Jul 11, 2006, at 11:55 AM, Dark Ambient wrote:
>
> > Just curious, I'm just learning about Procs, and have already
> > looked at
> > using blocks.
> > Are they very close in the way they function.  It seems that way to
> > me.
> > Perhaps I'm wrong.
> > Is one favoured above the other ?
>
> I see David has already answered your question here, but just in case
> it helps I wrote about this on my blog a while back:
>
> http://blog.grayproductions.net/articles/2006/01/05/code-as-a-data-type
>
> James Edward Gray II
>
>

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