**scanl** -base -bytestring

*O(n)* scanl is similar to foldl, but returns a list of successive reduced values from the left. Subject to fusion. Performs replacement on invalid scalar values.
> scanl f z [x1, x2, ...] == [z, z `f` x1, (z `f` x1) `f` x2, ...]
Note that
> last (scanl f z xs) == foldl f z xs.
scanl is similar to foldl, but returns a sequence of reduced values from the left:
> scanl f z (fromList [x1, x2, ...]) = fromList [z, z `f` x1, (z `f` x1) `f` x2, ...]
*O(n)* scanl1 is a variant of scanl that has no starting value argument. Subject to fusion. Performs replacement on invalid scalar values.
> scanl1 f [x1, x2, ...] == [x1, x1 `f` x2, ...]
scanl1 is a variant of scanl that has no starting value argument:
> scanl1 f (fromList [x1, x2, ...]) = fromList [x1, x1 `f` x2, ...]