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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>DOM Query</title>
</head>
<body>
Open your console
<div id="list-container">
<ul class="list">
<li class="list-item"></li>
<li class="list-item"></li>
<li class="list-item"></li>
<li class="list-item"></li>
<li class="list-item"></li>
</ul>
</div>
<div id="list-container2">
<ul class="list2">
<li class="list-item2"></li>
<li class="list-item2"></li>
<li class="list-item2"></li>
<li class="list-item2"></li>
<li class="list-item2"></li>
</ul>
</div>
<div id="list-container3">
<ul class="list3">
<li class="list-item3"></li>
<li class="list-item3"></li>
<li class="list-item3"></li>
<li class="list-item3"></li>
<li class="list-item3"></li>
</ul>
</div>
<script type="text/javascript">
// More dollar-signs more power?
window.$$ = (selectorString) => () => document.querySelectorAll(selectorString);
const queryString = '.list-item';
const queryString2 = '.list-item2';
const queryString3 = '.list-item3';
// 1 query test
console.time('1 query test: with caching');
$$(queryString);
$$(queryString);
console.timeEnd('1 query test: with caching');
console.time('1 query test: without caching');
document.querySelectorAll(queryString);
document.querySelectorAll(queryString);
console.timeEnd('1 query test: without caching');
// 10 query test
console.time('10 query test: with caching');
$$(queryString2);
for (let i = 0; i < 10; i++) {
$$(queryString2);
}
console.timeEnd('10 query test: with caching');
console.time('10 query test: without caching');
document.querySelectorAll(queryString2);
for (let i = 0; i < 10; i++) {
document.querySelectorAll(queryString2);
}
console.timeEnd('10 query test: without caching');
// 10,000 query test
console.time('10,000 query test: with caching');
$$(queryString3);
for (let i = 0; i < 10000; i++) {
$$(queryString3);
}
console.timeEnd('10,000 query test: with caching');
console.time('10,000 query test: without caching');
document.querySelectorAll(queryString3);
for (let i = 0; i < 10000; i++) {
document.querySelectorAll(queryString3);
}
console.timeEnd('10,000 query test: without caching');
</script>
</body>
</html>