From: "marcandre (Marc-Andre Lafortune)" Date: 2013-02-07T06:54:02+09:00 Subject: [ruby-core:51947] [ruby-trunk - Feature #7793][Assigned] New methods on Hash Issue #7793 has been updated by marcandre (Marc-Andre Lafortune). Category set to core Status changed from Closed to Assigned Assignee set to matz (Yukihiro Matsumoto) Fine, I'll reopen and assign this to Matz. ---------------------------------------- Feature #7793: New methods on Hash https://bugs.ruby-lang.org/issues/7793#change-35946 Author: dsisnero (Dominic Sisneros) Status: Assigned Priority: Normal Assignee: matz (Yukihiro Matsumoto) Category: core Target version: 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 def map_k reduce({}) do |result, array| k,v = array new_k = yield k result.merge(new_k => v) end end def map_kv reduce({}) do |result, array| new_k,new_v = yield array result.merge(new_k => new_v) end end end -- http://bugs.ruby-lang.org/