Check if packages are installed or attached
check_pkg_status(..., status, use_list = FALSE)(Dots) Package names as bare names, strings, or a vector of strings.
If left blank, returns a list of all packages that are installed/attached
depending on the value of status.
(Character) "installed" checks if packages are installed.
"attached" checks if packages are currently attached.
(Logical) If TRUE, a character vector of package names was
passed in ..1, so use that as the results list. This is for programming
use; nse_dots() already detects if a char vector of length > 1 is in
..1 and uses it as the package list automatically, but it does not do
that for char vectors of length 1 because the user can offer a mix of names
and strings to ... as a convenience.
If dots is empty, a character vector of package names. Otherwise,
return a named logical vector where TRUE means the package is installed
or attached, depending on the value of status.