const groupedItems = items.reduce((results,item) => {
if (item.id === 0) {
results.push(item);
} else {
results[item.id] = []
for (var i = 0; i < items.length; i++) { results[item.id].
const groupedItems = items.reduce((results,item) => {
(results[item.id] = results[item.id] || []).push(item);
return results;
}, {})