How to Hide Certain Pages from Certain Users (WP Dashboard)

There are instances wherein there is a need to hide some pages from certain users because we don’t want them to edit those pages.

Code snippet:

add_filter( 'pre_get_posts', 'removePageFromDashboard' );

function removePageFromDashboard($query) {
  $user = wp_get_current_user();
  if (is_admin() && in_array( 'editor', (array) $user->roles )) {
    $hide_pages = array(postid1, postid2);
    $query->set('post__not_in', $hide_pages);
    return $query;
  }

} //function