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Feature #7793

Updated by nobu (Nobuyoshi Nakada) almost 5 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

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