function helm-toggle() {
    if [ -z "$1" ]; then
        echo "helm client and Tiller (server side) versions always must match. Simply toggle between different Helm versions installed by brew".
        echo
        echo "Usage: helm-toggle <Helm version>"
        echo
        echo "installed helm versions are:"
        brew info --json=v1  kubernetes-helm | jq .[].installed[].version
        echo "current helm version is:"
        brew info --json=v1  kubernetes-helm | jq .[].linked_keg
    else
        brew switch kubernetes-helm $1 > /dev/null # no appropriate error handling here if someone sets something silly
    fi
}