Converts a NULL to NA; or returns the argument unchanged otherwise

This is useful for missing list elements (which returns NULL), but when the missing element in refClass should be NA (and NULL would return an error)

NULL_to_NA(var_or_NULL)

Arguments

var_or_NULL

A variable of any kind or NULL

Examples

  NULL_to_NA(NA)   ## NA
#> [1] NA
  NULL_to_NA(NULL) ## NA
#> [1] NA
  NULL_to_NA("hi") ## "hi"
#> [1] "hi"