Safely call a function using ellipsis
call_fn_ellipsis(FUN, ...)function that should be called with arguments in ...
arguments are passed to FUN() in safe manner.
output from FUN() when called with relevant named arguments
from ellipsis ...
This function is a wrapper function intended to help
pass ellipsis arguments ... from a parent function
to an external function in a safe way. It will only
include arguments from ... that are recognized by
the external function.
The logic is described as follows:
When the external function FUN arguments formals() include
ellipsis ..., then the ellipsis ... will be passed as-is without
change. In this way, any arguments inside the original ellipsis ...
will either match arguments in FUN, or will be ignored in that
function ellipsis ....
When the external function FUN arguments formals() do not
include ellipsis ..., then named arguments in ... are passed
to FUN only when the arguments names are recognized by FUN.
Note that arguments therefore must be named.
Other jam utility functions:
reload_rmarkdown_cache()
new_mean <- function(x, trim=0, na.rm=FALSE) {
mean(x, trim=trim, na.rm=na.rm)
}
x <- c(1, 3, 5, NA);
new_mean(x, na.rm=TRUE);
#> [1] 3
# throws an error as expected (below)
# new_mean(x, na.rm=TRUE, color="red");
call_fn_ellipsis(new_mean, x=x, na.rm=TRUE, color="red")
#> [1] 3
# throws an error as expected (below)
# call_fn_ellipsis(new_mean, x=x, color="red")