Proposal for containers: Add 'pop' function to Data.Map

[David Feuer]

I wrote deleteAt, so I could probably write this function somewhat more
easily than anyone else, once it has a name.

On Sun, Dec 6, 2020, 3:25 PM Martijn Bastiaan <martijn at hmbastiaan.nl> wrote:

> I've taken a look, and it seems like a non-trivial change. For now I've
> added a version that simply traverses two times for Seq, to have API parity
> with Map/IntMap. If people are happy to accept pop/popWithDefault (be it
> with different names) I'll put in the work to make it do a single traversal
> for Seq too.
> On 12/6/20 5:43 PM, David Feuer wrote:
>
> I suggest you add a version for Data.Sequence combining lookup with
> deleteAt. I wanted that for something fairly recently.
>
> On Sun, Dec 6, 2020, 11:41 AM Martijn Bastiaan via Libraries <
> libraries at haskell.org> wrote:
>
>> Yeah, Python's `pop` made me call it `pop`. I had hoped to find other
>> examples, but Java, Rust, and Ruby don't seem to offer `pop`-like
>> functions for their (hash)maps.
>>
>> On 12/6/20 5:29 PM, Tom Ellis wrote:
>> > On Sun, Dec 06, 2020 at 11:25:33AM -0500, David Feuer wrote:
>> >> The name pop makes me think of a stack. Is this use of the word common?
>> > Python uses that name, which is why I'm familiar with it:
>> >
>> >>>> d = {'a': 1, 'b': 2}
>> >>>> d.pop('b')
>> > 2
>> >>>> d
>> > {'a': 1}
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