Feature #8421: add Enumerable#find_map and Enumerable#find_all_map

• Status: Feedback
• Priority: Normal
• Assignee: -
• Target version: -

[Hanmac (Hans Mackowiak)]

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

[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.

[modulitos (Lucas Swart)]

In Ruby 2.7, I think we can use enumerable.lazy.filter_map{..}.first as an equivalent for .find_map{..}