Issue #6219 has been updated by shyouhei (Shyouhei Urabe).


Note however, that nobu changed st_update API[1] after I posted that.  So it might not apply cleanly to the latest ruby trunk...

[1]: http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?revision=35170&view=revision
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Feature #6219: Return value of Hash#store
https://bugs.ruby-lang.org/issues/6219#change-25359

Author: MartinBosslet (Martin Bosslet)
Status: Open
Priority: Low
Assignee: 
Category: core
Target version: 


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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