From: Siep Korteling <s.korteling@...>
Date: 2008-06-27T08:36:30+09:00
Subject: Re: Ruby way to find in an Array the object with a maximun in an attribute?

I単aki Baz Castillo wrote:
> El Viernes, 27 de Junio de 2008, I単aki Baz Castillo escribi坦:
>> - @domain = mydomain3.org
>> - @port = 5070
>>
>>
>> Which is the best way to get the final array? Thanks for any suggestion.
> 
> Done :)
> 
>  Array.sort! { |a,b| (a.priority <=> b.priority) }

Yes! "sort_by" is nice too. My code just gives the minima (using a 
struct, it should work with a class)

#preparation
Somestruct = Struct.new(:priority,:domain,:port)
ar = []
5.times do
  ar << Somestruct.new(rand(10),rand(10),rand(10))
end
puts ar

#let's go
smallest = ar.min{|x,y,|x.priority<=>y.priority}
minima = ar.select{ |element| element.priority==smallest.priority }
# in ruby 1.9 the last 2 lines can be replaced (i think) by
# minima = ar.min_by{|x|x.priority}
puts "only minimal priority's:"
puts minima

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