Remove NULL elements from list of lists

Question

How do I remove the null elements from a list of lists, like below, in R:

lll <- list(list(NULL),list(1),list(\"a\"))

The object I want

Answer 1

Using purrr

purrr::map(lll, ~ purrr::compact(.)) %>% purrr::keep(~length(.) != 0)
[[1]]
[[1]][[1]]
[1] 1

[[1]][[2]]
[1] 2

[[1]][[3]]
[1] 3


[[2]]
[[2]][[1]]
[1] "a"

[[2]][[2]]
[1] "b"

[[2]][[3]]
[1] "c"