tennis ranklist

function tennisRanklist(input) {
    let index = 0;
    let numberOfTournements = Number(input[index]);
    index++;
    let allPoints = Number(input[index]);
    index++;
    let currentPoints = 0;
    let points = 0;
    let winnerCounter = 0;


    for (let i = 0; i < numberOfTournements; i++) {
        let stageOfTheTournement = input[index];
        index++;

        switch (stageOfTheTournement) {
            case "W":
                points = 2000;
                winnerCounter++;
                break;
            case "F":
                points = 1200;
                winnerCounter++;
                break;
            case "SF":
                points = 720;
                winnerCounter++;
                break;
        }
    allPoints += points;
    currentPoints += points;
}
    let averagePoints = currentPoints / numberOfTournements;
    let percentWinner = (winnerCounter / numberOfTournements) * 100;

    console.log(`Final points: ${allPoints}`);
    console.log(`Average points: ${Math.floor(averagePoints)}`);
    console.log(`${percentWinner.toFixed(2)}%`);
}

tennisRanklist(["5",
"1400",
"F",
"SF",
"W",
"W",
"SF"]);