From: 7stud -- <lists@...>
Date: 2012-12-11T06:00:10+09:00
Subject: Re: Array of a class' attribute

Leo M. wrote in post #1088536:
>
> def erase_doubles
>
>   @results.each do |result|
>
>     #I REALLY DON'T HAVE IDEA ABOUT HOW TO BUILD IT :)
>
>   end
>


class Result
   attr_accessor :name, :link, :messages

   def initialize(name, link, msg)
     @name = name
     @link = link
     @msg = msg
   end
end

links = ['a', 'b', 'a', 'c', 'c']
names = ["Joe", "Bob", "Cathy", "Doug", "Carol"]
messages = ["mars", "venus", "jupiter", "mercury", "earth"]

links_enum = links.each
names_enum = names.each
msg_enum = messages.each

results = names.map do |link|
  Result.new(names_enum.next, links_enum.next, msg_enum.next)
end

p results

--output:--
[#<Result:0x00000101093290 @name="Joe", @link="a", @msg="mars">, 
#<Result:0x000001010931f0 @name="Bob", @link="b", @msg="venus">, 
#<Result:0x00000101093150 @name="Cathy", @link="a", @msg="jupiter">, 
#<Result:0x000001010930b0 @name="Doug", @link="c", @msg="mercury">, 
#<Result:0x00000101093010 @name="Carol", @link="c", @msg="earth">]


hash = Hash.new { |h, k| h[k] = [] }

results.each do |r|
  hash[r.link] = r
end

p hash.values

--output:--
[#<Result:0x00000101093150 @name="Cathy", @link="a", @msg="jupiter">, 
#<Result:0x000001010931f0 @name="Bob", @link="b", @msg="venus">, 
#<Result:0x00000101093010 @name="Carol", @link="c", @msg="earth">]

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