listlist?

#(listlist? obj) listlist? checks if an object is a list of lists

Parameter	Description
obj	The object to be checked

Example

Example 1: Verify that an object is a list of lists and flatten it.

> (define lst (list (list 1 2 3) (list 3 4 5)))
> (listlist? lst)
#t
> (flatten lst)
(1 2 3 4 5 6)