Create an ellipsis (...) from list

Question

Is it possible to create a ellipsis (...) from a list? The idea is to be able to do something like:

mylist <- list(a=1,b=2,c=3)
myellipsis <- create_ellipsis(mylist)
print(switch('a', myellipsis)) # output 1

Answer 1

You want do.call, which can pass the content of a list to a functions ... argument:

do.call(function(...) print(switch('a', ...)), mylist)