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# Ruby 1.8.6
pools = {1 => [1,2,3], 2 => [3,4,5], 3 => [5,6,7]}
values = pools.values.flatten
...

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class User
  named_scope :older_than, lambda { |u| { :conditions => ['age > u', u.age] } }
end
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event_times = events.collect { |event| event.datetime.strftime("%I:%M %p") }
times = times.reject { |time| event_times.include?(time.strftime("%I:%M %p'")) }

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module Enumerable
  def cluster
    self.uniq.sort.map { |u| self.select { |v| u == v } }
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def all_shops(products)
  products.map(&:shops).flatten.uniq
end

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def valid_param?(key)
  params[key] && params[key].length > 3
end
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{
  "0" => "24142",
  "1" => "15151",
...