Hi On 31 Oct 2009, at 10:39, Conor McBride wrote:
Hi
On 30 Oct 2009, at 16:14, Yusaku Hashimoto wrote:
Hello cafe, Do you know any data-type which is Applicative but not Monad?
[can resist anything but temptation]
I have an example, perhaps not a datatype: tomorrow-you-will-know
Elaborating, one day later, if you know something today, you can arrange to know it tomorrow if will know a function tomorrow and its argument tomorrow, you can apply them tomorrow but if you will know tomorrow that you will know something the day after, that does not tell you how to know the thing tomorrow Put otherwise, unit-delay is applicative but not monadic. I've been using this to organise exactly what happens when in those wacky miraculous-looking circular programs. It seems quite promising, so far... Cheers Conor