How to use

groupBy

function

in

Object

_(datatypes).groupBy('category').each((group, key) => {
  group = _.groupBy(group, (el) => el.sub_category || 'generic');
  desc += `### ${key} Types`;
  _.each(group, (types, sKey) => {
    if (sKey === 'generic') {
      desc += toMdList(types, 1);
    } else {
      desc += `\n#### ${_.upperFirst(sKey)} Types`;
      desc += toMdList(types, 2);
    }
  });
});