wordpress - loop array of term name, check if they exist as product_cat, if not - create them, after it attach them to post

$terms = array('A', 'B', 'C');
$terms_arr = array();
foreach($terms as $term){
  if(term_exists( $term, 'product_cat' )) {
    $term_arr[] = $term;
  }else{
    $term_arr[] = wp_insert_term( $term, 'product_cat' );
  }
}
wp_set_object_terms( $post_id, $term_arr, 'product_cat', false );