Re: [Haskell-beginners] Finding Keith Numbers with Haskell

On Tue, Nov 11, 2014 at 8:26 PM, Jack Mott wrote:

...

Thanks, is the notation with the single quote (isKeith') a convention for helper functions or does it actually change something about the program?

An unspoken coding convention.

Function foo' would be read "foo-prime". E.g.of usage: haskell-prime is the next standard of haskell, which became moot because you need good vibes for diverse peoples to collaborate on such an undertaking, including supporting it by writing more than one implementation.

Strictly syntax, the compiler doesn't treat it differently from any other name label.

So yes, you could have foo-double-prime and so forth. It's inherited from maths (like everything else). Very commonly used for a changed/new version of something. Comes up a lot in games

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 11/11/14 16:17, Kim-Ee Yeoh wrote: programming. One banal example: update :: World -> World update (World p p2 b e) = let p' = update p p2' = update p2 b' = update b e' = update e in World p' p2' b' e' where update = draw . move . react - -- Alexander alexander@plaimi.net https://secure.plaimi.net/~alexander -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iF4EAREIAAYFAlRjIzcACgkQRtClrXBQc7WPHwEAuIDb/vALYJ6Duz2ZDdB/tqHs l35idQYgOkngDrVe4pwA/0PcF4IUv8MwBAOI3kE8OiBDFTPhsS2SlRtmgihqXwty =XyN/ -----END PGP SIGNATURE-----