> When dealing with DB/API results, one can of course always say that such grouping in the client is an anti-pattern. It depends on how many data you're workin

> When dealing with DB/API results, one can of course always say that such grouping in the client is an anti-pattern. It depends on how many data you're working on. This groupBy is useful for filters in data tables. If you have to download a zillion of records and filter them, client side filtering is a bad idea. If you have a few thousands of them, it could possibly be the faster solution overall.