wishlist = [
    {:name => "mini puzzle", :size => "small", :clatters => "yes", :weight => "light"},
    {:name => "toy car", :size => "medium", :clatters => "a bit", :weight => "medium"},
    {:name => "card game", :size => "small", :clatters => "no", :weight => "light"}
]

presents = [
    {:size => "medium", :clatters => "a bit", :weight => "medium"},
    {:size => "small", :clatters => "yes", :weight => "light"}
]

# guess_gifts(wishlist, presents) # must return ['toy car', 'mini puzzle']

def guess_gifts(wishlist, presents)
  sizes = wishlist.map{|item| item[:size]}
  weights = wishlist.map{|item| item[:weight]}
  clatters = wishlist.map{|item| item[:clatters]}

  gifts = []
  presents.each do |present|
    guess = wishlist.find{|gift| present[:size] == gift[:size] &&
                         present[:clatters] == gift[:clatters] &&
                         present[:weight] == gift[:weight]  }

     gifts << guess[:name]
  end
  return gifts
end