Check if any of the elements in a list within a list is NULL

check_list_of_lists_null.R

library(rlist)
 
x <- list(list("ID"=1, "var1"="B", "var2"="D"),
          list("ID"=2, "var1"="F", "var2"="H"),
          list("ID"=3, "var1"="I", "var2"=NULL))
 
# rlist approach - returns FALSE
list.any(x, l ~ is.null(l))
 
# 2-level lapply - returns TRUE
any(unlist(lapply(x, function(x) lapply(x, function(x) ifelse(is.null(x), TRUE, FALSE)))))