using substitute to get argument name with

Question

I\'m trying to get the names of arguments in the global environment within a function. I know I can use substitute to get the name of named arguments, but I would like to b

Answer 1

I would go with

foo <- function(a, ...) {
print( n <- sapply(as.list(substitute(list(...)))[-1L], deparse) )
    n
}

Then

foo(x,y,z)
# [1] "y" "z"

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Related question was previously on StackOverflow: How to use R's ellipsis feature when writing your own function? Worth reading.

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Second solution, using match.call

foo <- function(a, ...) {
    sapply(match.call(expand.dots=TRUE)[-1], deparse)
}