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You can reach the person managing the list at beginners-ow...@haskell.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Beginners digest..." Today's Topics: 1. Re: Beginner question. (brad73435 Smith) ---------------------------------------------------------------------- Message: 1 Date: Tue, 12 Sep 2023 06:35:14 -0700 From: brad73435 Smith <brad73...@gmail.com> To: The Haskell-Beginners Mailing List - Discussion of primarily beginner-level topics related to Haskell <beginners@haskell.org> Subject: Re: [Haskell-beginners] Beginner question. Message-ID: <8e4007fd-fb45-43d8-9aa9-324f6c4c2...@gmail.com> Content-Type: text/plain; charset=utf-8 That’s an impressive step in complexity! FWIW, for ‘f x y = x <> " " <> y’ that website gave the same result as the book… ‘f = (<>) . (<> " ")’… so it seems to do a good job of giving a simplified solution. Understood re only using point-free for simple, clear cases… though it was a good exercise for me to understand what’s going on with the function composition operator (.). Thank you! Brad Sent from my iPhone > On Sep 12, 2023, at 1:08 AM, Sylvain Henry <sylv...@haskus.fr> wrote: > > Hi, > > https://pointfree.io/ gives: > > Input: f x y z = x <> " " <> y <> " " <> z > > Output: f = ((<>) .) . flip flip " " . ((<>) .) . (<>) . (<> " ") > > So no, it's not something simple! > > For clarity I would recommend using the non-point-free version, even in the > case given in the book. Use point-free only in simple cases like `map (+ 1)` > where the meaning is obvious. > > Sylvain > > >> On 12/09/2023 02:45, Brad Smith wrote: >> I just started working my way through a Haskell book... first time with >> functional programming. Mid way through the first chapter she's introducing >> point-free programming with a trivial example transitioning from not >> point-free... >> >> makeGreeting salutation person = salutation <> " " <> person >> >> to point free... >> >> makeGreeting' = (<>) . (<> " ") >> >> After a little playing with it... it seems to make sense. So I thought I'd >> try evolving from salutation and name to salutation, first, and last names. >> But, after a bit of tinkering, I haven't been able to make it work... >> >> I'm sure it's something simple (one way or the other)... any help would be >> appreciated! >> >> Brad >> >> _______________________________________________ >> Beginners mailing list >> Beginners@haskell.org >> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners > _______________________________________________ > Beginners mailing list > Beginners@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners ------------------------------ Subject: Digest Footer _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners ------------------------------ End of Beginners Digest, Vol 171, Issue 2 *****************************************