Extract non null elements from a list

Question

I have a list like this:

    x = list(a = 1:4, b = 3:10, c = NULL)
    x
    #$a
    #[1] 1 2 3 4
    #
    #$b
    #[1]  3  4  5  6  7  8  9 10
    #
    #$c
    #NULL

and I want to extract all elements that are not null. How can this be done? Thanks.

Answer 1

Here's another option:

Filter(Negate(is.null), x)