Proposal: add intersperse and intercalate to Data.Sequence

Edward Kmett ekmett at
Sat Dec 27 20:54:44 UTC 2014

+1 from me.

Interestingly, it strikes me that the fingertree version of intercalate
could be made more efficient, even if the sequence version can't.


On Sat, Dec 27, 2014 at 3:45 PM, David Feuer <david.feuer at> wrote:

> It seems there's enough interest to make it official. The usual two-week
> period begins now.
> Intersperse can be given very pleasant performance characteristics for
> sequences: the result can constructed incrementally as it is consumed.
> Intercalate cannot perform so pleasantly, but it seems odd to add one but
> not the other.
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