Check if a package is installed — check_for

Uses requireNamespace() to check if a package is already installed and provides options for issuing an error, warning, etc. in case the package is not installed.

Usage

check_for_pkg(package, func = stop)

Arguments

package: the name of the package to check for
func: what should this check call if the package is not installed? This can be any function, but stop, warning, skip, etc. are likely candidates (default: stop)

Value

TRUE if the package is installed, FALSE if it is not (invisibly)

Details

It is only exported for use in examples.

Examples

check_for_pkg("DBI")
check_for_pkg("no-such-package", func = message)
#> The package no-such-package isn't installed but is needed for this action.
#> Please install it with install.packages("no-such-package") and try again.