scripttictactoe.js

let boxes=document.querySelectorAll(".box");
let resetBtn=document.querySelector("#reset-btn");
let newGameBtn=document.querySelector("#newGame-btn");
let msgContainer= document.querySelector(".msg-container");
let msg=document.querySelector("#msg");

let turnO = true; //playerX,playerO

const winPatterns=[
    [0,1,2],
    [0,3,6],
    [0,4,8],
    [1,4,7],
    [2,5,8],
    [2,4,6],
    [3,4,5],
    [6,7,8],
];

const resetGame= () =>{
    turnO = true;
    enableBoxes();
    msgContainer.classList.add("hide");
}

boxes.forEach((box)=> {
    box.addEventListener("click", () =>{
        if (turnO){
            box.innerText="O";
            turnO=false;
        } else{
            box.innerText="X";
            turnO=true;
        }
        box.disabled=true;

        checkWinner();
    });
});
const disableBoxes=()=>{
    for (let box of boxes){
        box.disabled=true;
    }
}
const enableBoxes=()=>{
    for (let box of boxes){
        box.disabled=false;
        box.innerText="";
    }
}

const showWinner=(winner) =>{
    msg.innerText=`Congratulations, Winner is ${winner}`;
    msgContainer.classList.remove("hide");
    disableBoxes();
}
const checkWinner=() =>{
    for (let pattern of winPatterns){
        let pos1Val=boxes[pattern[0]].innerText;
        let pos2Val=boxes[pattern[1]].innerText;
        let pos3Val=boxes[pattern[2]].innerText;

        if(pos1Val != "" && pos2Val!="" && pos3Val!=""){
            if(pos1Val ===pos2Val && pos2Val=== pos3Val){
            showWinner(pos1Val);
            }
        }
    };
};

newGameBtn.addEventListener("click",resetGame);
resetBtn.addEventListener("click", resetGame);