Re: Discussion: Add total indexing function to Data.Sequence

+1 from me on 'lookup' and '!?'. Personally, I found the '!?' name intuitive immediately when I first saw it in Vector, so I'm a fan of it. Not as sure about 'lookup' because what it does on lists and maps is different from indexing (ie it works with key-value pairs), but it does scan significantly better than 'indexMay'. On Tue, May 31, 2016 at 1:38 AM, wren romano wrote:

On Sun, May 29, 2016 at 6:12 PM, Ivan Lazar Miljenovic wrote:

...

On 30 May 2016 at 07:21, David Feuer wrote:

...

Data.Sequence offers

index :: Seq a -> Int -> a

which throws an error if the index is out of range. I'd like to add something like

indexMay :: Seq a -> Int -> Maybe a

+1

(I personally don't like the "May" prefix used for functions like this as I don't find it very readable, but not enough to argue over the colour of the bikeshed ;-)

I too am +1 for the total function, but -1 for the "May" naming scheme.

I'd go with "lookup", since that's what (Int)Map does.

I'd also be fine with Vector's (!?) if folks really want a symbolic name. (IME this function tends to work better with an alphabetic name, ymmv)

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