From: "matz (Yukihiro Matsumoto)" <matz@...>
Date: 2012-03-31T11:13:07+09:00
Subject: [ruby-core:43987] [ruby-trunk - Feature #6219][Feedback] Return value of Hash#store


Issue #6219 has been updated by matz (Yukihiro Matsumoto).

Status changed from Assigned to Feedback


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Feature #6219: Return value of Hash#store
https://bugs.ruby-lang.org/issues/6219#change-25508

Author: MartinBosslet (Martin Bosslet)
Status: Feedback
Priority: Low
Assignee: matz (Yukihiro Matsumoto)
Category: core
Target version: 3.0


Hash#store returns the value that was just assigned, for example:

  h[:a] = b # => b

Does anyone rely on this behavior, are there cases when this becomes handy?

If however the return value is discarded most of the time, I was thinking it 
might be beneficial if we would return the previous value of a given key (nil if
none was assigned yet) instead. That way we could assign and check for a collision
in one pass, something that right now can only be done in two separate steps.




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