Re: [Haskell-cafe] (liftM join .) . mapM

I'd write it as foo f = join .<$> sequence . (f <$>) where (.<$>) :: (.<$>) :: Functor f => (a -> b) -> ((x -> f a) -> (x -> f b)) x .<$> y = (x <$>) . y is part of my line-noise toolbox. This join .* sequence family of functions is quite common. Should really have a name for them. Tony Morris-4 wrote:

Can (liftM join .) . mapM be improved? (Monad m) => (a -> m [b]) -> [a] -> m [b]

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