On May 9, 2010, at 07:18 , wren ng thornton wrote:
Where available, the fmap version is the most efficient. The liftM function can be less efficient since it's defined generically (namely with the bind/return definition above), whereas fmap can take advantage of knowing the specific monad it's working on. But then, not everyone defines Functor instances for their monads...
Arguably that deserves a bug report, as logically a Monad is an Applicative is a Functor (or read "is a" as "subset of" for pedantry).
-- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allb...@kf8nh.com system administrator [openafs,heimdal,too many hats] allb...@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH
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