length -package:bytestring -package:utf8-string -package:filepath -package:vector package:foldl

length :: Fold a Int
foldl Control.Foldl
Return the length of the container
length :: Num n => Fold ByteString n
foldl Control.Foldl.ByteString
Return the length of the byte stream in bytes
length :: Num n => Fold Text n
foldl Control.Foldl.Text
Return the length of the text stream in characters
genericLength :: Num b => Fold a b
foldl Control.Foldl
Like length, except with a more general Num return value