Enumerable#find_and_replace(cond, &block)

log

1.9.3p362 :002 > [1,2,3,4,5].find_and_replace(:odd?, &:to_s)
 => ["1", 2, "3", 4, "5"] 
1.9.3p362 :003 > [1,2,3,4,5].find_and_replace(Proc.new(&:odd?), &:to_s)
 => ["1", 2, "3", 4, "5"] 
1.9.3p362 :005 > [1,2,3,4,5].find_and_replace(->(x) { x.odd? }, &:to_s)
 => ["1", 2, "3", 4, "5"]
1.9.3p362 :006 > [1,2,3,4,5].find_and_replace(->(x) { x.odd? }) do |x|
1.9.3p362 :007 >   x.to_s
1.9.3p362 :008?> end
 => ["1", 2, "3", 4, "5"]


# Hashes!

1.9.3p362 :037 > h.find_and_replace(->(k,v) { v > 10 }) {|k,v| v.to_s }
 => [2, 3, "19"] 
1.9.3p362 :038 > h.find_and_replace(->(k,v) { v > 10 || k == :key1 }) {|k,v| v.to_s }
 => ["2", 3, "19"]
1.9.3p362 :049 > h.find_and_replace(:odd?) {|k,v| v.to_s }
 => [2, "3", "19"]

script.rb

module Enumerable
  def find_and_replace(cond, &block)
    self.map do |x|
      if cond.instance_of?(Symbol)
        res = Array(x).last.send(cond)
      else
	      res = cond.call(*x)
      end
      
      res ? yield(*x) : Array(x).last
    end
  end
end