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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<script src="https://unpkg.com/react@17/umd/react.production.min.js" crossorigin></script>
<script src="https://unpkg.com/react-dom@17/umd/react-dom.production.min.js" crossorigin></script>
<script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
<style>
#app {
text-align: center;
font-family: 'Courier New', Courier, monospace;
font-size: xx-large;
}
.heading {
font-family: 'Courier New', Courier, monospace;
}
h2 {
font-size: 5rem;
margin-bottom: 20px;
}
.instruction {
font-size: 36px;
margin: 0px 10px;
}
#problem {
font-size: 144px;
margin: 8% 0%;
}
.transitionIn {
animation-name: fadeIn;
animation-duration: 2s;
animation-fill-mode: forwards;
}
.transitionOut {
animation-name: fadeOut;
animation-duration: 2s;
animation-fill-mode: forwards;
}
.incorrect {
color: red;
}
input {
width: 300px;
padding:2%;
font-size: 72px;
text-align: center;
border-radius: 5%;
outline-color: gray;
outline-style: solid;
outline-width: 3px;
}
.game_info {
font-size: 72px;
margin-top: 5%;
}
#score {
font-size: 72px;
margin-top: 5%;
}
#score[inc='1'] {
animation-name: flashRed;
animation-duration: 2s;
animation-fill-mode: forwards;
}
#levelup {
margin-top: 20%;
color: green;
font-size: 108px;
text-shadow: 3px 3px gray;
animation-name: fadeIn;
animation-duration: 3s;
animation-fill-mode: forwards;
}
#winner {
margin-top: 20%;
color: goldenrod;
text-shadow: 3px 3px gray;
animation-name: grow;
animation-duration: 5s;
animation-fill-mode: forwards;
}
#loser {
margin-top: 20%;
color: purple;
font-size: 144px;
animation-name: wiggle;
animation-duration: 5s;
animation-fill-mode: forwards;
animation-iteration-count: 10;
}
@keyframes fadeOut {
from {
opacity: 100%;
}
to {
opacity: 0%;
}
}
@keyframes fadeIn {
0% {
opacity: 0%;
}
100% {
opacity: 100%;
}
}
@keyframes grow {
from {
font-size: 0px;
}
to {
font-size: 144px;
}
}
@keyframes wiggle {
0% {
transform: rotate(0deg);
}
25% {
transform: rotate(-15deg);
}
75% {
transform: rotate(15deg);
}
100% {
transform: rotate(0deg);
}
}
@keyframes flashRed {
0% {
color: red;
}
100% {
color: black;
}
}
</style>
<title>React practice: Addition</title>
</head>
<body>
<div id="app"></div>
<script type="text/babel">
function App() {
const [state, setState] = React.useState({
level: 1,
num1: 1,
num2: 1,
response: "",
score: 0,
incorrect: false,
score_down: 0,
});
// To reset after game is over
function reset() {
setState({
level: 1,
num1: 1,
num2: 1,
response: "",
score: 0,
incorrect: false,
score_down: 0,
});
}
// To levelup
function nextLevel() {
setState({
...state,
num1: generateProblem(1)[0],
num2: generateProblem(1)[1],
response: "",
score: 0,
incorrect: false,
score_down: 0,
level: state.level + 1,
});
}
// Update for user input
function updateResponse(event) {
setState({
...state,
response: event.target.value
});
}
function getRandomArbitrary(min, max) {
return Math.ceil(Math.random() * (max - min) + min);
}
// Reset num1 and num2 according to level
function generateProblem(levelOffset) {
let num1, num2;
if (state.level + levelOffset === 1) {
num1 = getRandomArbitrary(1, 5),
num2 = getRandomArbitrary(1, 5)
}
if (state.level + levelOffset === 2) {
num1 = getRandomArbitrary(6, 10),
num2 = getRandomArbitrary(1, 5)
}
if (state.level + levelOffset === 3) {
num1 = getRandomArbitrary(6, 10),
num2 = getRandomArbitrary(6, 10)
}
return [num1, num2]
}
function inputKeyPress(event) {
if (event.key === "Enter") {
const answer = parseInt(state.response);
if (answer === state.num1 + state.num2) {
// User got question right
setState({
...state,
num1: generateProblem(0)[0],
num2: generateProblem(0)[1],
score: state.score + 1,
response: "",
incorrect: false,
score_down: 0,
});
} else {
// User got question wrong
setState({
...state,
score: state.score - 1,
response: "",
incorrect: true,
score_down: 1
});
}
}
}
// Winning scene
if (state.score === 10) {
if (state.level < 3) {
return (
<div onClick={nextLevel}>
<p id="levelup">You level up!</p>
<p class="instruction">Click to Continue</p>
</div>
);
}
if (state.level === 3) {
return (
<div onClick={reset}>
<p id="winner">You won!</p>
<p class="instruction">Click to Restart</p>
</div>
);
}
}
// Losing scene
if (state.score < 0) {
return (
<div onClick={reset}>
<p id="loser">You lose!</p>
<p class="instruction">Click to Restart</p>
</div>
);
}
// Next problem
return (
<div>
<div class="heading">
<h2>Addition</h2>
<p class="instruction">Score 10 to {state.level < 3 ? 'level up' : 'win'}.</p>
<p class="instruction">Lose if score below 0.</p>
</div>
<div className="game_info">Level: {state.level}</div>
<div
id="problem"
className={state.incorrect ? "incorrect" : ""}>
{state.num1} + {state.num2}
</div>
<input autoFocus onKeyPress={inputKeyPress} onChange={updateResponse} value={state.response} type={Number}/>
<div
id="score"
inc={state.score_down}
className="game_info"
onAnimationEnd={() => setState({
...state,
score_down: 0
})}>
Score: {state.score}
</div>
</div>
);
}
ReactDOM.render(<App />, document.querySelector("#app"));
</script>
</body>
</html>