Ruby » Ruby master

Feature #7793

Updated by nobu (Nobuyoshi Nakada) about 10 years ago

=begin 
 It would be nice to have the following methods added to hash 

 ~~~ruby 
 

   h = { name: 'dominic', request: 'add the following methods', :why => 'convenience'} 

 

   h.map_v{|v| v.upcase} 
 
   #=> {:name=>"DOMINIC", :request=>"ADD THE FOLLOWING METHODS", :why=>"CONVENIENCE"} 

 

   h.map_k{|k| k.to_s} 
 
   #=> { "name"=> 'dominic', "request"=>"add the following methods', "why" => "convenience"} 

 

   h.map_kv{|k,v| [k.to_s, v.upcase]} 
 
   #=> { "name"=>"DOMINIC", "request"=>"ADD THE FOLLOWING METHODS", "why"=>"CONVENIENCE"} 


 


   class Hash 

   

     def map_v 
     
       reduce({}) do |result, array| 
       
         k,v = array 
       
         new_val = yield v 
       
         result.merge( k => new_val) 
       end 
     end 
   end 

   

     def map_k 
     
       reduce({}) do |result, array| 
       
         k,v = array 
       
         new_k = yield k 
       
         result.merge(new_k => v) 
       end 
     end 
   end 

   

     def map_kv 
     
       reduce({}) do |result, array| 
       
         new_k,new_v = yield array 
       
         result.merge(new_k => new_v) 
       end 
     end 
   

   end 

 end 
 =end 

Back