Ruby array of hash. group_by and modify in one line

Question

I have an array of hashes, something like

[ {:type=>\"Meat\", :name=>\"one\"}, 
  {:type=>\"Meat\", :name=>\"two\"}, 
  {:type=>\"Fruit\", :n         


        

Answer 1

array = [{:type=>"Meat", :name=>"one"}, {:type=>"Meat", :name=>"two"}, {:type=>"Fruit", :name=>"four"}]
array.inject({}) {|memo, value| (memo[value[:type]] ||= []) << value[:name]; memo}