Neggfest Tarot Odds Calculator

// ==UserScript==
// @name         Neggfest Tarot Odds Calculator
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  bored
// @author       Rippy
// @match        http*://*.neopets.com/neggfest/?playtarot=1
// @icon         https://www.google.com/s2/favicons?sz=64&domain=neopets.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    let cards;
    const cardNum = 22;
    const _resetGameBoard = resetGameBoard;
    const _startTarotGame = startTarotGame;
    $("#TarotGameButtons").append("<div id='tarotOdds'></div>");
    function calculateOdds() {
        const current = parseInt($("#TarotCard1Num").text());
        cards.splice(cards.indexOf(current), 1);
        const higher = cards.filter(e => e > current);
        console.log(cards);
        console.log(higher);
        $("#tarotOdds").text(`Higher: ${(higher.length/cards.length * 100).toFixed(3)}% | Lower: ${((cards.length - higher.length)/cards.length * 100).toFixed(3)}%`);
    }
    startTarotGame = () => {
        cards = [...Array(cardNum).keys()];
        _startTarotGame();
    };
    resetGameBoard = () => {
        cards = [...Array(cardNum).keys()];
        _resetGameBoard();
    };
    const observer = new MutationObserver(calculateOdds);
    observer.observe(document.querySelector("#TarotCard1Num"), {childList: true});
})();