chain game code [rock, scissor, paper]

class chainGame {
    /**
     *
     * @param {Array} hands two players hands. e.g. [1,2]
     * @param {Array} symbols  symbols of the game
     */
    constructor(hands, symbols) {
        this.hands = hands
        this.symbols = symbols
    }
    /**
     * @returns {Object} {
                *              winnerId: 0, 1, or null
                *              winnerSymbols: [winnerSymbol, loserSymbol]  ; will return [1stPlayerSymbol, 2ndPlayerSymbol] if there is a tie
     *                   }
     */
    winner() {        
        let winnerId = null; //tie is the default value. so only needs to calculate winner              
        let winnerSymbols = [];
        let difference = Math.abs(this.hands[0]-this.hands[1]);
        let sortedHands = [];
        switch (difference) {
            case 1:
                winnerId = (this.hands[0] < this.hands[1]) ? 0: 1
                sortedHands = (this.hands[0] < this.hands[1]) ? this.hands : this.hands.reverse();
                break;
            case this.symbols.length -1:
                winnerId = (this.hands[0] > this.hands[1]) ? 0 : 1
                sortedHands = (this.hands[0] > this.hands[1]) ? this.hands : this.hands.reverse();
                break;
            default:
                sortedHands = this.hands
                break;
        }

        winnerSymbols = [this.symbols[this.hands[0]], this.symbols[this.hands[1]]]

        return {
            winnerId: winnerId,
            winnerSymbols: winnerSymbols,
        }
    }
}

//global consts
// const symbols = ["rooster", "worm", "stick", "tiger"]
const symbols = ["rock", "scissor", "paper"]
const players = ["Dave", "John"]



const handOfDave = Math.floor(Math.random() * symbols.length)
const handOfJohn = Math.floor(Math.random() * symbols.length)
const shownImageName = [symbols[handOfDave], symbols[handOfJohn]]
let winnerMessage = ""

const currentGame = new chainGame([handOfDave, handOfJohn], symbols)
const result = currentGame.winner()

let theVerb = ""
if (result.winnerId === null) {
    winnerMessage = "A tie!"
    theVerb = "meets"
} else {
    winnerMessage = players[result.winnerId] + " " + "won!"
    theVerb = "beats"
}

winnerMessage = `${winnerMessage} ${result.winnerSymbols[0]} ${theVerb} ${result.winnerSymbols[1]}`