Extract names of dataframes passed with dots
You can try the following:
names_from_dots <- function(...) sapply(substitute(list(...))[-1], deparse)
names_from_dots(swiss, iris)
# [1] "swiss" "iris"
I wouldn’t use substitute
here at all, it works badly with ...
1. Instead, you can just capture the unevaluated dots using:
dots = match.call(expand.dots = FALSE)$...
Then you can get the arguments inside the dots:
sapply(dots, deparse)
1 Part of the reason is, I think, that substitute
does completely different things when called with (a) an argument (which is a “promise” object) or (b) another object. ...
falls somewhere in between these two.