[ruby-core:55045] [ruby-trunk - Feature #8421][Open] add Enumerable#find_map and Enumerable#find_all_map

Issue #8421 has been reported by Hanmac (Hans Mackowiak).

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Feature #8421: add Enumerable#find_map and Enumerable#find_all_map
https://bugs.ruby-lang.org/issues/8421

Author: Hanmac (Hans Mackowiak)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


currently if you have an Enumerable and you want to return the return value of #find you need eigther:
  (o = enum.find(block) && block.call(o)) || nil
or
  enum.inject(nil) {|ret,el| ret || block.call(el)}

neigher of them may be better than an directly maked method

same for #find_all_map
  enum.lazy.map(&:block).find_all{|el| el}

it may work but it is not so good


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