day_149_tournament.js

function tournamentScores(matchArray = ['', '']) {
    let teamDataMap = new Map();
    matchArray.forEach((matchString) => {
        let [team1, team2] = matchString.split(' - ');
        let [team1Name,team1Goals] = team1.split(' ');
        let [team2Name,team2Goals] = team1.split(' ');
        addToMap(teamDataMap,team1Name,Number(team1Goals),Number(team2Goals));
        addToMap(teamDataMap,team2Name,Number(team2Goals),Number(team1Goals));
    });
    let result = [...teamDataMap.entries()].map(array => Array.from([array[0]]).concat(array[1]));
    result.sort(([team1, pt1, gs1, gd1], [team2, pt2, gs2, gd2]) => {
        if (pt1 === pt2) {
            if (gs2 === gs1) {
               return (gd1 - gd2);
            }
            return (gs1 - gs2);
        }
         return pt1-pt2;
    });
  return result;
}

function addToMap(teamDataMap = new Map(), team1Name = '', team1Goals = 1, team2Goals = 1) {
    if (teamDataMap.get(team1Name) !== undefined) {
        let teamData = teamDataMap.get(team1Name);
        teamData[0] += team1Goals > team2Goals ? 3 : (team1Goals === team2Goals ? 1 : 0);
        teamData[1] += team1Goals;
        teamData[2] += team1Goals - team2Goals;
        teamDataMap.set(team1Name, teamData)
    } else {
        teamDataMap.set(team1Name, [team1Goals > team2Goals ? 3 : (team1Goals === team2Goals ? 1 : 0), team1Goals, team1Goals-team2Goals])
    }
}