odin-rps/index.js

const choices = ["rock", "paper", "scissors"];

function getComputerChoice() {
    return choices[Math.floor(Math.random() * 3)];
}

function playRound(playerChoice, computerChoice) {
    let playerChoiceCapital = playerChoice.slice(0,1).toUpperCase() + playerChoice.slice(1,playerChoice.length)
    let computerChoiceCapital = computerChoice.slice(0,1).toUpperCase() + computerChoice.slice(1,computerChoice.length)

    if (playerChoice == computerChoice) {
        points.playerAddPoints();
        points.computerAddPoints();
        return `It's a tie! ${playerChoiceCapital} vs ${computerChoiceCapital}.`;
    } else if ((playerChoice == "rock" && computerChoice == "paper")
            || (playerChoice == "paper" && computerChoice == "scissors")
            || (playerChoice == "scissors" && computerChoice == "rock")) {
        points.computerAddPoints();
        return `You lost! ${computerChoiceCapital} beats ${playerChoiceCapital}.`;
    } else if ((playerChoice == "rock" && computerChoice == "scissors")
            || (playerChoice == "paper" && computerChoice == "rock")
            || (playerChoice == "scissors" && computerChoice == "paper")) {
        points.playerAddPoints();
        return `You won! ${playerChoiceCapital} beats ${computerChoiceCapital}.`;
    }
}

const points = (() => {
    this.player = 0;
    this.computer = 0;
    function playerAddPoints() {
        player++;
    }
    function computerAddPoints() {
        computer++;
    }
    function reset() {
        player = 0;
        computer = 0
    }
    return {get player() {return player},
            get computer() {return computer},
            playerAddPoints, computerAddPoints, reset};
})()

function game() {
    points.reset();

    for (let i = 0; i < 5; i++) {
        let correctOption = false
        let playerChoice;
        
        while (correctOption == false) {
            playerChoice = prompt("What do you choose, 'rock', 'paper' or 'scissors'?");
            if (playerChoice) {
                choices.forEach(element => {
                    if (playerChoice.toLowerCase().trim() == element) {
                        correctOption = true
                        return;
                    }
                })
            } else if (confirm(`Do you wanna quit the game?`)) {
                throw new Error("Exited the game on user's request");
            }
        }
        
        let round = playRound(playerChoice, getComputerChoice());
        let pointsString = `Points: ${points.player}:${points.computer}\n`;
        alert(pointsString + round);
    }

    let confirmString;
    if (points.player > points.computer) {
        confirmString = `You won ${points.player}:${points.computer}`
    } else if (points.player == points.computer) {
        confirmString = `That was a ${points.player}:${points.computer} tie`
    } else if (points.player < points.computer) {
        confirmString = `You lost ${points.player}:${points.computer}`
    }
    if (confirm(`${confirmString}, do you wanna restart the game?`)) {
        game();
    }
}

game();