code: function traverseObject(toSearchObj, searchForObj) {
      const allKeys = Object.keys(toSearchObj);
      const len = allKeys.length;
  
      for (let i = 0; i < len; i++) {
        const key = allKeys[i];
        const val = toSearchObj[key];
  
        if (searchForObj[key] && !results[key]) {
          results[key] = val;
        } else if (isObject(val)) {
          traverseObject(val, searchForObj);
        } else if (isArray(val)) {
          traverseArray(val, searchForObj);
        }
      }
    }
docs: /* Object, Object -> Void