Get multiple term IDs by slug, and then exclude them in get_terms

I want to exclude multiple terms in get_terms, but the exclude parameter only accepts term IDs. So I have to get the term IDs from its slug.

This is what I have so far:

$pres = get_term_by('slug', 'president', $cat_type);
$vice = get_term_by('slug', 'vice-president', $cat_type);
$admin = get_term_by('slug', 'admin', $cat_type);
$rnd = get_term_by('slug', 'rnd', $cat_type);

$ID_pres = $pres->term_id;
$ID_vice = $vice->term_id;
$ID_admin = $admin->term_id;
$ID_rnd = $rnd->term_id;

$terminologies = get_terms( $cat_type, array(
                    'orderby'   => 'term_id',
                    'exclude'   => '???' <<<<
                ) );

I felt there’s something really wrong and redundant here but I’m not sure how to put them into an array that can be used in theexclude parameter. Any help?

You can get terms, from multiple slugs, with the slug argument:

$exclude = get_terms ( 
    [ 
        'slug'     => [ 'president', 'vice-president', 'admin', 'rnd' ], 
        'taxonomy' => $cat_type,
        'fields'   => 'ids',
    ] 
);

where we use the fields argument to return only term ids.