Proposal: Add singleton function to Data.List module

[Brent Yorgey]

At the risk of completely derailing the conversation, I have always called
this the "robot monkey operator".  I fail to see what is so ninja-like
about it.

Anyway, I think I am +1 on adding Data.List.singleton.

-Brent

On Mon, Aug 12, 2019, 12:35 PM Zemyla <zemyla at gmail.com> wrote:

> I also like the ninja-robot operator, because it's visually
> interesting and easy to search for.
>
> Also, if you're importing several libraries which already use
> "singleton", then you have to use "List.singleton" every time, which
> is far uglier to me.
>
> On Mon, Aug 12, 2019 at 12:03 PM Herbert Valerio Riedel
> <hvriedel at gmail.com> wrote:
> >
> > > - `(:[])`: Subjectively ugly.
> >
> > I consider "subjectively ugly" to be a non-technical and thus really
> > weak argument to dismiss the list-idiomatic ninja-robot-operator (:[])
> > which also happens to be shorter than the proposed alias for it. I for
> > one don't see a significant benefit for adding a redundant synonym to
> > `Data.List` and are thus -1 on this.
> >
> > > singleton :: a -> [a]
> > > singleton x = [x]
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