R Under development (unstable) (2025-12-16 r89184 ucrt) -- "Unsuffered Consequences"
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> message("*** devListIndexOf() ...")
*** devListIndexOf() ...
> 
> library("R.devices")
R.devices v2.17.3 successfully loaded. See ?R.devices for help.
> 
> .devListIndexOf <- R.devices:::.devListIndexOf
> 
> labels <- list(character(0L), "Device 1", c("Device 1", "Device 1"), c("Device 1", "FooBar"))
> for (label in labels) {
+   res <- .devListIndexOf(label, error=FALSE)
+   print(res)
+   stopifnot(is.integer(res))
+   stopifnot(is.character(names(res)))
+ }
named integer(0)
Device 1 
       1 
Device 1 Device 1 
       1        1 
Device 1   FooBar 
       1       NA 
> 
> message("*** devListIndexOf() ... DONE")
*** devListIndexOf() ... DONE
> 
> proc.time()
   user  system elapsed 
   0.32    0.15    0.46