Ruby » Ruby master

Feature #7793

Updated by nobu (Nobuyoshi Nakada) almost 12 years ago

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

   

 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

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