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Feature #7793

New methods on Hash

Added by dsisnero (Dominic Sisneros) over 7 years ago. Updated over 5 years ago.

Status:
Assigned
Priority:
Normal
Target version:
-
[ruby-core:51933]

Description

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

Related issues

Related to Ruby master - Feature #6669: A method like Hash#map but returns hashFeedbackmatz (Yukihiro Matsumoto)Actions
Related to Ruby master - Feature #4151: Enumerable#categorizeRejectedakr (Akira Tanaka)Actions
Related to Ruby master - Feature #7292: Enumerable#to_hClosedmarcandre (Marc-Andre Lafortune)11/07/2012Actions
Related to Ruby master - Feature #10552: [PATCH] Add Enumerable#frequencies and Enumerable#relative_frequenciesOpen11/27/2014Actions
Related to Ruby master - Feature #12512: Import Hash#transform_values and its destructive version from ActiveSupportClosedmatz (Yukihiro Matsumoto)Actions
Has duplicate Ruby master - Feature #9970: Add `Hash#map_keys` and `Hash#map_values`Opennobu (Nobuyoshi Nakada)Actions

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