Yes, Hayoo seems to be giving better results, I found more variants having the behavior I want, it seems this variant is quite popular but still not in any standard libraries. Interestingly the problem of too many choices and no standard one that can be discovered applies to search engines as well. In this case there are only two choices but still it is of the same nature. I knew about hayoo but forgot to use it in this case. How much time should one spend on finding a trivial function before giving up and making the choice to write their own? I wish there was a standard, quick, good quality way of discovering what to use. It seems the Haskell ecosystem DNA encourages more and more fragmentation rather than consolidation. I think the community/leaders should acknowledge this problem and work on making things better in the short/long run. -harendra On 5 February 2018 at 22:02, Sergiu Ivanov wrote:

Hello Harendra,

Thus quoth Harendra Kumar on Mon Feb 05 2018 at 16:43 (+0100):

...

The irony is that theoretically you can find a Haskell package or implementation of whatever you can imagine but quite often it takes more time to discover it than writing your own.

Sometimes Hayoo! helps me out in such situations:

http://hayoo.fh-wedel.de/?query=groupBy

utility-ht shows up.

-- Sergiu