Function pick

api/whois.js:12–23

(results, ...keys)

// Walk every WHOIS/RDAP source, return the first non-empty value across the given keys
const pick = (results, ...keys) => {
  for (const src of Object.values(results)) {
    for (const key of keys) {
      const v = src?.[key];
      if (v === undefined || v === null) continue;
      if (typeof v === 'string' && !v.trim()) continue;
      if (Array.isArray(v) && !v.length) continue;
      return v;
    }
  }
  return undefined;
};

// Lower-case + dedupe nameservers, drop empty entries
const cleanNs = (ns) => {