From: "matz (Yukihiro Matsumoto)" <matz@...>
Date: 2013-05-18T18:53:08+09:00
Subject: [ruby-core:55049] [ruby-trunk - Feature #8421][Feedback] add Enumerable#find_map and Enumerable#find_all_map


Issue #8421 has been updated by matz (Yukihiro Matsumoto).

Status changed from Open to Feedback

Could you tell me a concrete use-case of your find_map and find_all_map?
Usually a block for find/find_all gives boolean so that I personally have never wanted the return value from it.

Matz.

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Feature #8421: add Enumerable#find_map and Enumerable#find_all_map
https://bugs.ruby-lang.org/issues/8421#change-39420

Author: Hanmac (Hans Mackowiak)
Status: Feedback
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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