Check if list of list is empty

Learning
1

I want to write a function to return false for this case
let mylist = [ [ ] ];;

return true for this case
let mylist = [ [1] ];;

and return true for this case
let mylist = [ [ ] ; [1] ];;

How can I do this?

2

You will want to read about pattern matching.

3

Pattern matching and List flattening will help.

https://caml.inria.fr/pub/docs/manual-ocaml/libref/List.html

4

What about []? [[];[]]?