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

Here's an option using Filter and Negate combination

Filter(Negate(function(x) is.null(unlist(x))), lll)
# [[1]]
# [[1]][[1]]
# [1] 1
#
#
# [[2]]
# [[2]][[1]]
# [1] "a"