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A friend helped me find a solution…

teams() {
            return this.trackers.reduce((teams, tracker) => {
                if (teams.find(team => team.info.team_id === tracker.team.info.team_id) === undefined) {
                    teams.push(tracker.team);
                } else {
                    let index = teams.findIndex(team => team.info.team_id === tracker.team.info.team_id);
                    if (tracker.team.tracker.timestamp > teams[index].tracker.timestamp) {
                        teams[index] = tracker.team;
                    }
                }
                teams.sort(function(a, b){
                    return a.tracker.diff-b.tracker.diff
                })
                return teams;
            }, []);
        }

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