On 2008 Sep 24, at 17:44, Iain Barnett wrote:
On 24 Sep 2008, at 10:13 pm, Evan Laforge wrote:
For one approach, check out 'replicate' to make copies of something, and then 'sequence' to run them and return a list.
Thanks, I haven't found anything that explains 'sequence' well yet, but I'll keep looking.
sequence turns a list of monadic values into a monadic list of values, i.e. [m a] becomes m [a]. In IO, this is [IO a] -> IO [a]. This lets you do something like replicate an I/O action, then turn the list of I/ O actions into a single I/O action on a list. -- 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