[ruby-core:35724] [Ruby 1.9 - Feature #4553] Add Set#pick and Set#pop

Issue #4553 has been updated by Jonas Pfenniger.


#pop is often associated to stack operations, which implies an order. Unless a better name is found, isn't set.delete(set.take) enough ?

#take can be an alias of #first but I'm not sure if Enumerable should be included in Set in the first place. In my POV, Enumerable is for elements that have a particular order.

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Feature #4553: Add Set#pick and Set#pop
http://redmine.ruby-lang.org/issues/4553

Author: Michael Edgar
Status: Open
Priority: Low
Assignee: 
Category: 
Target version: 


A very common operation on sets is to take an arbitrary element from them at O(1) cost. I know typically
it's suggested that library additions go out as a gem to see community review. However, to me it seems
to be a glaring omission to lack such an operation on a built-in, fundamental data structure, so I've
gone straight to the bug tracker.

I wasn't too sure which method names to use as I've often heard "take" in lieu of "pop," so I just used the
names Wikipedia uses. Consider them flexible. "Pick" selects an arbitrary element, and "pop" selects and
deletes it.

I've provided a very simple patch that implements the necessary behavior. Thoughts?


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