Issue #13563 has been updated by saturnflyer (Jim Gay). babanba-n (matzbara masanao) wrote: > I feel that Hash#slice is wrong name and Hash#pick is better name. > If key is not exist, key omit or return nil. > It is difficult problem. I prefer Hash#pick over Hash#choice. I would expect the missing keys to return whatever the default value of the hash is. ~~~ ruby hash = Hash.new('foo') hash[:bar] = 'hello world' hash.pick(:baz, :bar) #=> {:baz => 'foo', :bar => 'hello world' } ~~~ ---------------------------------------- Feature #13563: Implement Hash#choice method. https://bugs.ruby-lang.org/issues/13563#change-65088 * Author: babanba-n (matzbara masanao) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- Hi, I propose Hash#choice method. It pick up key and value pairs in Hash like a below code. ~~~ { :a => 1, 2 => "2", "c" => true }.choice(:a, 2) # => { :a => 1, 2 => "2" } { :a => 1, 2 => "2", "c" => true }.choice("c", 10000) # => { "c" => true, 10000 => nil } ~~~ This method is useful when Hash have many keys, but programer need few key's. For instance, it pick up personal data in ActiveRecord model's data, and migrate to new device. ~~~ feature_phone_user = User.find(params[:src_user_id]) profile = feature_phone_user.attributes.choice(*%i[nickname email sex birthday prefecture]) smart_phone_user = User.new smart_phone_user.attributes = profile ~~~ In other case, it pick up latest log from http request parameter. ~~~ condition = params.to_h.choice("user_id", "service_id") latest_payment_log = PaymentLog.find_by(condition).last ~~~ If this method exist, I guess that many cases change to comfortable just a little. Please consider about it. And I write it. https://github.com/baban/ruby/commit/4014ebe2ae261881669bef8369eb08aaecef2034 -- https://bugs.ruby-lang.org/