20 Oct
2007
20 Oct
'07
7:10 p.m.
On Oct 20, 2007, at 15:05 , Andrew Coppin wrote:
I can quite happily construct a program which, given the first line, yields the last line. But getting it to print all the intermediate steps is harder. And, like I said, when something is "hard" in Haskell, it usually means you're doing it the wrong way... ;-)
This is the Writer monad. -- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery@kf8nh.com system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH