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rock-paper-scissors.js
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rock-paper-scissors.js
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// To show rock papter scissors img
const imgPositionObj = {
rock: "-40px",
paper: "-170px",
scissors: "-320px",
};
let imgPosition = imgPositionObj.rock;
// To use calculation for checking winner;
const scoreToCheckWin = {
scissors: 1,
rock: 0,
paper: -1,
};
// Set computer player rock paper scissors.
let interval;
function setComputerPlayerInterval() {
interval = setInterval(() => {
if (imgPosition === imgPositionObj.rock) {
imgPosition = imgPositionObj.paper;
} else if (imgPosition === imgPositionObj.paper) {
imgPosition = imgPositionObj.scissors;
} else {
imgPosition = imgPositionObj.rock;
}
const image = document.querySelector("#computer");
image.style.background =
"url(./assets/rock-paper-scissor.jpg) " + imgPosition + " -470px";
image.style.backgroundSize = "500px";
}, 50);
}
// Start computer player
setComputerPlayerInterval();
function getComputerScore(computerPlayer) {
// To prevent too much hard coding, get array by Object.entries() and find key by value
return Object.entries(imgPositionObj).find((p) => {
return p[1] === computerPlayer;
})[0];
}
function checkWinner(player, computerPlayer) {
let myScore = scoreToCheckWin[player];
let comScore = scoreToCheckWin[getComputerScore(computerPlayer)];
let diffScore = myScore - comScore;
// If diffScore is one of winScoreArr value, play wins.
const winScoreArr = [-1, 2];
if (diffScore === 0) {
alert("Same");
} else if (winScoreArr.includes(diffScore)) {
alert("You win");
} else {
alert("You lose");
}
}
document.querySelectorAll(".btn").forEach((btn) => {
btn.addEventListener("click", function () {
clearInterval(interval);
checkWinner(btn.id, imgPosition);
// Restart computer player
setComputerPlayerInterval();
});
});