Issue #7793 has been updated by marcandre (Marc-Andre Lafortune).

Status changed from Open to Closed

I am glad to see that more people like you take the time to propose ways to create hashes.

I completely agree that hash creation from Enumerable is lacking currently.

I will close this feature request because I am convinced it can't be accepted as is (the proposed names have no chance of being accepted) and because it is largely duplicated by the following:

https://bugs.ruby-lang.org/issues/6669
https://bugs.ruby-lang.org/issues/4151
https://bugs.ruby-lang.org/issues/7292

If you have the time, read on those and see if you can contribute.

Thanks
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Feature #7793: New methods on Hash
https://bugs.ruby-lang.org/issues/7793#change-35932

Author: dsisnero (Dominic Sisneros)
Status: Closed
Priority: Normal
Assignee: 
Category: 
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


-- 
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