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lottery.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>lottery generator</title>
</head>
<body>
<h1>refresh page to get new lottery number</h1>
<p></p>
<script>
const generate = (count) => Array(count).fill(1).map((_, index) => index + 1);
const get = (count, source) => {
const result = [];
for (let i = 0; i < count; i++) {
const len = source.length;
const index = Math.min(Math.round(len * Math.random()), len - 1);
result.push(source[index]);
source.splice(index, 1);
}
return result.sort((a, b) => a - b);
};
const LEFT_COUNT = 5;
const RIGHT_COUNT = 2;
const LEFT = generate(35);
const RIGHT = generate(12);
const LEFT_RESULT = get(LEFT_COUNT, LEFT);
const RIGHT_RESULT = get(RIGHT_COUNT, RIGHT);
const result = LEFT_RESULT.concat(RIGHT_RESULT);
console.log(result);
const p = document.getElementsByTagName('p')[0];
p.innerHTML = `result: ${result.join(' ')}`;
</script>
</body>
</html>