How to check if a list of apt packages are already installed?

[felipecrs]

Title says all.

[felipecrs]

function is_apt_package_installed() {
  local package="$1"

  apt list --quiet --quiet --installed "${package}" 2>/dev/null | grep --quiet .
}

if is_apt_package_installed curl; then
  echo "curl is installed"
else
  echo "curl is not installed"
fi