[ruby-core:46105] [ruby-trunk - Feature #6687][Open] Enumerable#with

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Issue #6687 has been reported by merborne (kyo endo). ---------------------------------------- Feature #6687: Enumerable#with https://bugs.ruby-lang.org/issues/6687 Author: merborne (kyo endo) Status: Open Priority: Normal Assignee: Category: Target version: =begin Let me propose `Enumerable#with` for an alias of `Enumerable#each_with_object` or replace of it. `Enumerable#each_with_object`??柴?具?扎?芥?Ｕ?嫘????整????胯????桃蔭???????????具????艾??`Enumerable#with`??????獢??????整????? ##Reason ##?????? When you create a hash using `Enumerable#inject`, you should ensure that the block return the hash. `Enumerable#inject`???雿踴?�?艾??????瑯?乓????????????????具????怒?胯???????准????胯?株???????扎?具????艾??????瑯?乓??餈?????????具??靽?閮潦?????敹?閬????????????整????? words.inject(Hash.new(0)) { |h, word| h[word] += 1; h } # => {"You"=>3, "say"=>10, "Yes"=>1, "I"=>7, "No"=>1, "Stop"=>1, "and"=>2, "Go"=>1, "go"=>2, "Oh"=>1, "no"=>1, "Goodbye"=>2, "Hello"=>2, "hello"=>5, "don"=>2, "t"=>2, "know"=>2, "why"=>2, "you"=>2, "goodbye"=>1} Many rubyists, however, hate this, and there are many discussions for it. ?????????????????????憳????Rubyist??臬????????????????銝???扼????格?孵????怒?扎????艾?株降隢?????????啜????啗??????????整????? Feature #5662: inject-accumulate, or Haskell's mapAccum* - ruby-trunk - Ruby Issue Tracking System http://bugs.ruby-lang.org/issues/5662 Ruby inject with intial being a hash - Stack Overflow http://stackoverflow.com/questions/9434162/ruby-inject-with-intial-being-a-hash `Enumerable#each_with_object` is often presented for one of the best solutions for it. ????????艾????格???????芾圾瘙箇????具????艾??Enumerable#each_with_object??????蝷箝???????艾????整???????? words.each_with_object(Hash.new(0)) { |word, h| h[word] += 1 } # => {"You"=>3, "say"=>10, "Yes"=>1, "I"=>7, "No"=>1, "Stop"=>1, "and"=>2, "Go"=>1, "go"=>2, "Oh"=>1, "no"=>1, "Goodbye"=>2, "Hello"=>2, "hello"=>5, "don"=>2, "t"=>2, "know"=>2, "why"=>2, "you"=>2, "goodbye"=>1} However, `each_with_object` is still unfamiliar and then not used frequently. The biggest reason, I think, is its lengthy name. ?????????????????格????冽?扼?怒??????????????靘???嗚?具?????each_with_object??桃?亙??摨艾???????喳?拍?券?餃漲??臭?????冽?????????整?????????????艾???????桀???????胯???????桀???????桅?瑯????怒???????刻???????整????? `each_with_object` is the 39th longest-name method among 754 at Ruby 1.9.3, based on following calculation; 隞乩????格??蝞???怒????????Ruby1.9.3??桃?啣??銝????each_with_object??胯??754隞嗡葉39??芰?柴?恍?瑯??????????柴?～?賬???????扼??????????具?????????????整???????? methods = Module.constants.flat_map do |c| next [] if c == :Gem k = Module.const_get(c) k.methods(false) + k.instance_methods(false) rescue [] end.uniq.reject { |m| "#{m}".start_with? '_deprecated' }.sort_by { |m| -m.size } methods.size # => 754 methods.index(:each_with_object) # => 39 puts methods.take(100).group_by(&:size).to_a The output is here. ??箏????扼????? 26 protected_instance_methods instance_variable_defined? 25 protected_method_defined? 24 private_instance_methods 23 class_variable_defined? public_instance_methods define_singleton_method private_method_defined? 22 singleton_method_added public_instance_method public_method_defined? 21 instance_variable_get instance_variable_set remove_class_variable 20 private_class_method repeated_combination repeated_permutation compare_by_identity? 19 respond_to_missing? abort_on_exception= public_class_method compare_by_identity 18 undefine_finalizer instance_variables abort_on_exception class_variable_get class_variable_set relative_path_from 17 internal_encoding external_encoding default_internal= default_external= protected_methods singleton_methods ascii_compatible? 16 global_variables executable_real? initialize_clone each_with_object # <= Here! require_relative private_constant default_external included_modules instance_methods define_finalizer default_internal 15 private_methods fixed_encoding? class_variables instance_method each_with_index public_constant garbage_collect source_location valid_encoding? singleton_class world_writable? local_variables world_readable? method_defined? 14 readable_real? locale_charmap const_defined? collect_concat initialize_dup add_trace_func close_on_exec= close_on_exec? named_captures set_trace_func write_nonblock writable_real? each_codepoint force_encoding public_methods 13 const_missing each_filename default_proc= set_backtrace public_method read_nonblock instance_exec absolute_path count_objects instance_eval 12 marshal_load reverse_each exclude_end? instance_of? make_symlink set_encoding block_given? default_proc slice_before marshal_dump 11 rationalize realdirpath each_object expand_path with_object This result shows that methods which has 15+ name length is mostly for reflection or for special purpose. `each_with_object` is a general purpose method, the name should be shorter. ?????柴?芥?嫘??????????????????????具?胯????瑯??15???頞?????????～?賬???????胯????桀之????????芥????研?胯?瑯?扼?喟?具????寞????桃????具?柴????柴?扼???????具?????鈭?摰???扼?????each_with_object??胯?????瘙?函????芥?～?賬???????扼????????????????桀???????胯????�?函?准?????????嫘????刻???????整???????嗚?桅?瑯????胯???????柴?～?賬??????????～???????柴?怒????艾????整????? I propose Enumerable#with for it. a word `object` in `each_with_object` is obvious and not necessary to spcify the purpose, because all data in Ruby is `object`. Also, a word `each` in `each_with_object` is not essential, then omittable in view of the fact that it is called to Enumerable object. I think that a word `with` still works for describing the same of `each_with_object`. ?????????Enumerable#with??????獢??????整???????整?????Ruby??扳?晞????????????潦?踴?胯????嫘?艾?芥????詻?扼?胯????扼???????????each_with_object??怒????????object??航?芣??扼?????銝?閬???刻???????整?????甈～?怒??Enumerable??芥????詻?扼?胯????怠紋????????～?賬???????潦?喳?箝????具???????嫘?????閬???艾??each???敹??????柴????柴?具?航????????????????文?賬?刻???????整?????????????行????�??with??批???????怒????桃?桃???????扎?整??Enumerable??芾??蝝????隞餅???柴?芥????詻?扼?胯????典?晞?急??雿?????????????????喋?扼????艾???????刻???????整????? Lastly, following is examples with `Enumerable#with` ???敺???怒??`Enumerable#with`???雿踴?�??靘????蝷箝????整????? Enumerable.send(:alias_method, :with, :each_with_object) words.with(Hash.new(0)) { | word, h| h[word] += 1 } # => {"You"=>3, "say"=>10, "Yes"=>1, "I"=>7, "No"=>1, "Stop"=>1, "and"=>2, "Go"=>1, "go"=>2, "Oh"=>1, "no"=>1, "Goodbye"=>2, "Hello"=>2, "hello"=>5, "don"=>2, "t"=>2, "know"=>2, "why"=>2, "you"=>2, "goodbye"=>1} [*1..10].with(5).map(&:*) # => [5, 10, 15, 20, 25, 30, 35, 40, 45, 50] ['ruby', 'python', 'haskell'].with('ist').map(&:+) # => ["rubyist", "pythonist", "haskellist"] Thank you for your consideration. ???璊?閮?桃????????????????憿??????氬????整????? =end -- http://bugs.ruby-lang.org/