Re: Add DList to base

On 9 June 2017 at 14:15, Tony Morris wrote:

Yeah, those are in lens, so I am less concerned that they don't appear in base. Specifically, if DList were not to exist in base, and I use the typeclasses that we all know as well as lens, what am I missing out on?

From a brief skim through the DList module documentation, those are the only functions defined that do not have direct analogues in existing typeclasses in base.

On Fri, Jun 9, 2017 at 10:30 AM, Ivan Lazar Miljenovic wrote:

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On 9 June 2017 at 09:41, Tony Morris wrote:

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Are there any DList specific functions, that are not provided by existing type-classes (such as Foldable), that are typically used? I can think of a few, but they are all in lens.

singleton, cons, snoc

Though if you have singleton (which can be obtained from either Endo or GHC.Ext.IsList.fromList and `(:[])`; alternatively you could use pure/return but that is less pleasant IMO than the singleton function for code legibility purposes) and mappend you can do cons and snoc.

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On Tue, Jun 6, 2017 at 4:24 PM, Henning Thielemann wrote:

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On Mon, 5 Jun 2017, David Feuer wrote:

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DList x just doesn't have much more to offer than Endo [x]. We already have Endo; ergo, we don't need DList.

I admit that I already used Endo as a quickly available DList replacement.

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-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com http://IvanMiljenovic.wordpress.com

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com http://IvanMiljenovic.wordpress.com