Remove empty elements from list with character(0)

Question

How can I remove empty elements from a list that contain zero length pairlist as character(0), integer(0) etc...

list2
# $`hsa:7476         


        

Answer 1

One possible approach is

Filter(length, l)
# [[1]]
# [1] 1 2 3
# 
# [[2]]
# [1] "foo"

where

l <- list(1:3, "foo", character(0), integer(0))

This works due to the fact that positive integers get coerced to TRUE by Filter and, hence, are kept, while zero doesn't:

as.logical(0:2)
# [1] FALSE  TRUE  TRUE