scripts.js

const cards = document.querySelectorAll('.memory-card');

let hasFlippedCard = false;
let lockBoard = false;
let firstCard, secondCard;

function flipCard() {

    if (lockBoard) return;
    if (this === firstCard) return;

    this.classList.add('flip');

    if (!hasFlippedCard) {
        //first click
        hasFlippedCard = true;
        firstCard = this;

        return;
    }
    //second click
    hasFlippedCard = false;
    secondCard = this;

    checkForMatch();
}

function checkForMatch() {

    let isMatch = firstCard.dataset.framework === secondCard.dataset.framework;

    isMatch ? disableCards() : unflipCards();
}

function disableCards() {
    firstCard.removeEventListener('click', flipCard);
    secondCard.removeEventListener('click', flipCard);

    resetBoard();
}

function unflipCards() {
    lockBoard = true;

    setTimeout(() => {
        firstCard.classList.remove('flip');
        secondCard.classList.remove('flip');

        resetBoard();
    }, 1500)
}

function resetBoard() {
    [hasFlippedCard, lockBoard] = [false, false];
    [firstCard, secondCard] = [null, null];
}

(function shuffle() {
    cards.forEach(card =>{
        let randomPos = Math.floor(Math.random() * 12);
        card.style.order = randomPos;
    })
})();

cards.forEach(card => card.addEventListener('click', flipCard));

let next_level_btn;
next_level_btn.addEventListener('click', startNextLevel);

function startNextLevel() {

}