[erlang-questions] Proposal: add lists:intersperse/2 and lists:intercalate/2

[Benoit Chesneau]

this would be. an interresting addition...
On Mon, 11 Apr 2016 at 14:59, Siraaj Khandkar <siraaj@REDACTED> wrote:

> I think my personal reservation about the name "intersperse" is
> addressed by the possibility of later extending to include interval
> specification, something like this:
>
>      intersperse(A, [A], Interval) -> [A]
>          when Interval :: random | {regular, pos_integer()} | ... .
>
> where the default is thought of as {regular, 1}.
>
>
> P.S. I'm crossing my fingers, hoping Robert will not like "join"! :-)
>
>
> On 4/11/16 8:06 AM, Jesper Louis Andersen wrote:
> > Reviving this. There is now a PR for the proposal:
> >
> > https://github.com/erlang/otp/pull/1012
> >
> > The name is hard. I'm on the verge of asking Robert Virding what it
> should
> > be and then use him as the BDFL. I'm not going to ask Joe, since then we
> > would have disagreement between him and Robert :)
> >
> >
> >
> > On Wed, Mar 2, 2016 at 3:47 PM, Jesper Louis Andersen <
> > jesper.louis.andersen@REDACTED> wrote:
> >
> >> Hi Erlangers,
> >>
> >> I'd really like to add two functions to the lists module from Haskell:
> >>
> >> intersperse(List, Seperator) produces a list where each element is
> >> separated by separator, i.e.
> >>
> >> X = [1,2,3]
> >> [1, x, 2, x, 3] = lists:intersperse(X, x),
> >>
> >> and it's cousin, intercalate(ListOfLists, Separator) is
> >> append(intersperse(ListOfLists, Seperator)), i.e,
> >>
> >> Y = ["a", "b", "c"]
> >> "a, b, c" = lists:intercalate(Y, ", "),
> >>
> >> The implementations are straightforward and easy to write tests for,
> even
> >> property based tests if needed.
> >>
> >> The rationale for this proposal is that I find myself implementing this
> >> function again and again in every project I write, and it is highly
> >> generic. It belongs in a typical list module. OCaml libraries add it.
> >> Haskell's Data.List has it. I believe Erlang, being a practical
> language,
> >> should have it as well.
> >>
> >> Thoughts?
> _______________________________________________
> erlang-questions mailing list
> erlang-questions@REDACTED
> http://erlang.org/mailman/listinfo/erlang-questions
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://erlang.org/pipermail/erlang-questions/attachments/20160415/239d6191/attachment.htm>