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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Patching HTML</title>
<style>
.items {
margin: 1em 0;
padding: 0;
display: flex;
flex-wrap: wrap;
gap: 2px;
}
.items > * {
display: flex;
align-items: center;
justify-content: center;
width: 3em;
height: 2em;
margin: 0;
padding: 0;
background: #eee;
}
</style>
</head>
<body>
<div id="app"></div>
<script type="module">
import { measureName, measureMemory } from './util.js';
import { createRoot, createElement as h, Component } from 'framework';
function Row(props) {
return h('article', null, props.children);
}
function App(props) {
return h('div', {}, [
h(
'div',
{ class: 'items' },
props.items.map(id => h(Row, { key: id }, id))
)
]);
}
const count = 1000;
const start = 20;
const end = 600;
const newItems = () =>
Array(count)
.fill(0)
.map((item, i) => i);
let items = newItems();
let currentItems = items;
const root = createRoot(document.getElementById('app'));
root.render(h(App, { items }));
function runPatch() {
items = newItems().filter(id => {
const isVisible = currentItems.includes(id);
return id >= start && id <= end ? !isVisible : isVisible;
});
currentItems = items;
root.render(h(App, { items }));
}
async function warmup() {
const count = 25;
for (let i = 0; i < count; i++) {
runPatch();
await new Promise(r => requestAnimationFrame(r));
}
}
warmup().then(async () => {
performance.mark('start');
runPatch();
await new Promise(r => requestAnimationFrame(r));
performance.mark('stop');
performance.measure(measureName, 'start', 'stop');
measureMemory();
});
</script>
</body>
</html>
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