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Anthony Albertorio22,169 Points
Why not use .filter() instead of .reduce() for getAttendingGuests()?
Why not use simpler code?
getAttendingGuests = () => this.state.guests.filter( guest => guest.isConfirmed).length;
Steven Parker210,867 Points
The code might be a bit more compact, but I'd expect that the "reduce" version is more efficient. Try them both in a benchmarking tool and see!.