我有一系列哈希.
rabbits = [{:color =>"blue",:height => 5,:name =>"Charles"},{:color =>"red",:height => 12,:name =>"Henry"} ,{:color =>"green",:height => 7,:name =>"Francis"},{:color =>"purple",:height => 3,:name =>"William"}]
如何从这个只有:height的数组创建一个数组？
我试过了rabbits.map(&:height),rabbits.map{|i| i.height}但都没有奏效.
目标是拥有 height_array = [5, 12, 7, 3]