How can I insert a slug instead of an ID in this code?

I’d like to use the slug of the category instead of the ID (62). For example, I’d like to insert watch-isatv in place of 62. Is this even possible and if so, how can I format it?

function excludeCat($query) {
if ( $query->is_home ) {
$query->set(‘cat’, ‘-62’);
}
return $query;
}
add_filter(‘pre_get_posts’, ‘excludeCat’);

Also, I tried using (category_name, slug-of-post); but that didn’t work either.