How to Redirect 404 page to the Home Page using All 404 Redirect to Homepage

//Page 404 to homepage

function test_redirect_404_to_homepage(){

    if( is_404() ){

        wp_redirect( home_url(), 301 );

        exit();

    }

}

add_action('template_redirect', 'test_redirect_404_to_homepage');

*****************************************************

// 404 page redirect to homepage

if( !function_exists('redirect_404_to_homepage') ){

    add_action( 'template_redirect', 'redirect_404_to_homepage' );

    function redirect_404_to_homepage(){

       if(is_404()):

            wp_safe_redirect( home_url('/') );

            exit;

        endif;

    } 

}