How to disable comment on wordpress without plugin

 //comment disable code

/* 1.  Disable Comments on ALL post types */ 

function updated_disable_comments_post_types_support() {

   $types = get_post_types();

   foreach ($types as $type) {

      if(post_type_supports($type, 'comments')) {

         remove_post_type_support($type, 'comments');

         remove_post_type_support($type, 'trackbacks');

      }

   }

}

add_action('admin_init', 'disable_comments_post_types_support');

/* 2. Hide any existing comments on front end */ 

function disable_comments_hide_existing_comments($comments) {

   $comments = array();

   return $comments;

}

add_filter('comments_array', 'disable_comments_hide_existing_comments', 10, 2);

/* 3. Disable commenting */ 

function disable_comments_status() {

   return false;

}

add_filter('comments_open', 'disable_comments_status', 20, 2);

add_filter('pings_open', 'disable_comments_status', 20, 2);