Discussion on: Daily Challenge #174 - Soccer League Table

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Definitely some things missing and room for improvement but here we go. JavaScript.

const calcPoints = Symbol('calcPoints');

class LeagueTable {
    constructor() {
        this.matches = [];
        this.teamMapping = null;
    }

    [calcPoints](a, b) {
        return a > b ? 3 : a === b ? 1 : 0;
    }

    push(matchString) {
        let rawScore = matchString.match(/\d+\s*\-\s*\d+/g)[0];

        let teamGoals = rawScore.split('-').map(x => parseInt(x.trim()));

        let names = matchString.split(rawScore).map(x => x.trim());

        if (!this.teamMapping) {
            this.teamMapping = names.map((x, i) => ({ key: i, value: x }));
        }

        let teamOne = {
            teamId: this.teamMapping.find(x => x.value === names[0]).key,
            goals: teamGoals[0],
            gd: teamGoals[0] - teamGoals[1],
            points: this[calcPoints](teamGoals[0], teamGoals[1])
        };

        let teamTwo = {
            teamId: this.teamMapping.find(x => x.value === names[1]).key,
            goals: teamGoals[1],
            gd: teamGoals[1] - teamGoals[0],
            points: this[calcPoints](teamGoals[1], teamGoals[0])
        };

        this.matches.push(teamOne);
        this.matches.push(teamTwo);
    }

    getPoints(teamName) {
        let teamId = this.teamMapping.find(x => x.value === teamName).key;

        return this.matches
            .filter(x => x.teamId === teamId)
            .reduce((acc, v) => acc + v.points, 0);
    }

    getGoalsFor(teamName) {
        let teamId = this.teamMapping.find(x => x.value === teamName).key;

        return this.matches
            .filter(x => x.teamId === teamId)
            .reduce((acc, v) => acc + v.goals, 0);
    }

    getGoalsAgainst(teamName) {
        let teamId = this.teamMapping.find(x => x.value !== teamName).key;

        return this.matches
            .filter(x => x.teamId === teamId)
            .reduce((acc, v) => acc + v.goals, 0);
    }

    getGoalDifference(teamName) {
        let teamId = this.teamMapping.find(x => x.value !== teamName).key;

        return this.matches
            .filter(x => x.teamId === teamId)
            .reduce((acc, v) => acc + -v.gd, 0);
    }

    getWins(teamName) {
        let teamId = this.teamMapping.find(x => x.value === teamName).key;

        return this.matches
            .filter(x => x.teamId === teamId)
            .reduce((acc, v) => (v.points > 1 ? acc + 1 : acc), 0);
    }

    getDraws(teamName) {
        let teamId = this.teamMapping.find(x => x.value === teamName).key;

        return this.matches
            .filter(x => x.teamId === teamId)
            .reduce((acc, v) => (v.points === 1 ? acc + 1 : acc), 0);
    }

    getLosses(teamName) {
        let teamId = this.teamMapping.find(x => x.value === teamName).key;

        return this.matches
            .filter(x => x.teamId === teamId)
            .reduce((acc, v) => (v.points === 0 ? acc + 1 : acc), 0);
    }
}

let lt = new LeagueTable();
lt.push('Man Utd 3 - 0 Liverpool');
console.log(`Goals : ${lt.getGoalsFor('Man Utd')}`);
console.log(`Points : ${lt.getPoints('Man Utd')}`);
console.log(`Points : ${lt.getPoints('Liverpool')}`);
console.log(`Goal Difference : ${lt.getGoalDifference('Liverpool')}`);
lt.push('Liverpool 1 - 1 Man Utd');
console.log(`Goals : ${lt.getGoalsFor('Man Utd')}`);
console.log(`Points : ${lt.getPoints('Man Utd')}`);
console.log(`Points : ${lt.getPoints('Liverpool')}`);
console.log(`Goals Against : ${lt.getGoalsAgainst('Man Utd')}`);