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

I would do as below :

hsh =[{:type=>"Meat", :name=>"one"}, {:type=>"Meat", :name=>"two"}, {:type=>"Fruit", :name=>"four"}]
p Hash[hsh.group_by{|h| h[:type] }.map{|k,v| [k,v.map{|h|h[:name]}]}]

# >> {"Meat"=>["one", "two"], "Fruit"=>["four"]}