From: "zverok (Victor Shepelev) via ruby-core" <ruby-core@...>
Date: 2024-03-19T20:50:02+00:00
Subject: [ruby-core:117239] [Ruby master Feature#8421] add Enumerable#find_map and Enumerable#find_all_map

Issue #8421 has been updated by zverok (Victor Shepelev).


@alexbarret There is a somewhat lesser-known trick which looks pretty close to your code:
```ruby
# proposal:
find_map(emails) do |email|
  (matches = pattern.match(email)) && matches[:identifier]
end
# a "trick"
emails.find { |email| match = pattern.match(email) and break match[:identifier] }
# => "thecode"
```
It might even be considered two tricks, depending on your point of view: the control-flow `and` allows to chain any statements to it (note it doesn't need extra parentheses after assignment), and `break value` allows to return a non-standard value from a block.

Not saying it is beautiful, just one more option.



----------------------------------------
Feature #8421: add Enumerable#find_map and Enumerable#find_all_map
https://bugs.ruby-lang.org/issues/8421#change-107326

* Author: Hanmac (Hans Mackowiak)
* Status: Feedback
----------------------------------------
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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