Issue #8490 has been updated by rosenfeld (Rodrigo Rosenfeld Rosas).


I don't see any issues with index_by, but how about map_by? And what is wrong with the semantics?
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Feature #8490: Bring ActiveSupport Enumerable#index_by to core
https://bugs.ruby-lang.org/issues/8490#change-39727

Author: rosenfeld (Rodrigo Rosenfeld Rosas)
Status: Rejected
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: core
Target version: 


It seems to be a common sense to have the useful implementation of Enumerable#index_by as in ActiveSupport.

index_by acts like group_by but only maps a single record, instead of an array, keeping the last match only. It's usually used in places where you shouldn't have more than a single match for each key.

Would you consider its inclusion to core Enumerable module?


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