genericLength package:streamly-core

genericLength :: forall (m :: Type -> Type) b a . (Monad m, Num b) => Fold m a b
streamly-core Streamly.Internal.Data.Fold
Like length, except with a more general Num return value Definition: 
>>> genericLength = fmap getSum $ Fold.foldMap (Sum . const  1)

>>> genericLength = Fold.foldl' (\n _ -> n + 1) 0
Pre-release
genericLength :: forall (m :: Type -> Type) b a . (Monad m, Num b) => Scanl m a b
streamly-core Streamly.Internal.Data.Scanl
Like length, except with a more general Num return value Definition: 
>>> genericLength = fmap getSum $ Scanl.foldMap (Sum . const  1)

>>> genericLength = Scanl.mkScanl (\n _ -> n + 1) 0
Pre-release