Completely remove comments from Wordpress

functions.php

// Remove comments from Wordpress
add_action('admin_menu', 'theme_remove_admin_menus');
function theme_remove_admin_menus()
{
	remove_menu_page('edit-comments.php');
}
// Removes from post and pages
add_action('init', 'theme_remove_comment_support', 100);

function theme_remove_comment_support()
{
	remove_post_type_support('post', 'comments');
	remove_post_type_support('page', 'comments');
}
// Removes from admin bar
function theme_admin_bar_render()
{
	global $wp_admin_bar;
	$wp_admin_bar->remove_menu('comments');
}
add_action('wp_before_admin_bar_render', 'theme_admin_bar_render');