[Request] names for tstrsplit results

[franknarf1]

On SO, I found myself doing...

trial = c("9-5", "7-5", "13-3", "17-6")
wdays = c("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday")
setDT(tstrsplit(trial, "-", type.convert=TRUE))[, 
  paste0(wdays[V2 + 1], " ", V1, ":00")
]

It would be nice if I could instead do

with( tstrsplit(trial, "-", type.convert=TRUE, list.names=TRUE), 
  paste0(wdays[V2 + 1], " ", V1, ":00")
)

so V1, V2, etc are the names in the result.

The list.names arg could be extended to specify other naming rules as well.

[DavidArenburg]

I'm wondering if a syntax such setDT(df)[, ":="(tstrsplit(x, ",", names = TRUE))] should be allowed too since now this is a named list? This will both save the effort of finding out apriory how many columns we supposed to get after the split and shorten the syntax