'modifyList' drops (not adds) NULL components
On Thu, Jun 27, 2013 at 10:59 PM, Raubertas, Richard
<richard_raubertas at merck.com> wrote:
Dear list, Utils::modifyList() drops NULL components in its second argument, instead of adding them to the first argument. Compare:
modifyList(x=list(A=1), val=list(B=2, C=3))
$A [1] 1 $B [1] 2 $C [1] 3
modifyList(x=list(A=1), val=list(B=NULL, C=3))
$A
[1] 1
$C
[1] 3
To me this seems inconsistent with the documentation ("Elements in 'val' which are missing from 'x' are added to 'x'."),
Agreed.
and also with how I'd want the function to behave.
Note that you still get
foo <- modifyList(x=list(A=1), val=list(B=NULL, C=3)) foo$B
NULL So is there a specific reason you want the NULL elements to be explicitly listed? -Deepayan
sessionInfo()
R version 3.0.1 Patched (2013-06-16 r62969) Platform: x86_64-w64-mingw32/x64 (64-bit) locale: [1] LC_COLLATE=English_United States.1252 [2] LC_CTYPE=English_United States.1252 [3] LC_MONETARY=English_United States.1252 [4] LC_NUMERIC=C [5] LC_TIME=English_United States.1252 attached base packages: [1] stats graphics grDevices utils datasets methods base Richard Raubertas Merck & Co.