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  1. Ruby
  2. Hash
  3. Hash Extensions

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class Hash
  def find_all
    new_hash = Hash.new
    each { |k,v| new_hash[k] = v if yield(k, v) }
    new_hash
  end
end

squares = {0=>0, 1=>1, 2=>4, 3=>9}
squares.find_all { |key, value| key > 1 }        # => {2=>4, 3=>9}








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