Benchmark: event delegation: closest vs cached

HTML Preparation code:

<ul class='manyC'>
</ul>

<ul class='manyW'>
</ul>

<template class='content'>
  <li data-x='2'>
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Script Preparation code:

var templ = document.querySelector(`.content`);

var manyC = document.querySelector(`.manyC`);
var manyCLinks = [];

var manyW = document.querySelector(`.manyW`);
var manyWLinks = [];

var x = 0;
function handleEvent(li) {
  x += (li.dataset.x|0);
}

function cHandleEvent(ev) {
  handleEvent(ev.target.closest(`li`));
}

const k = Symbol();
function wHandleEvent(ev) {
  let t= ev.target;
  let li = t[k];
  if (li === undefined) {
    t[k] = li = ev.target.closest(`li`)
  }
  handleEvent(li);
}

var n = 1000;
for (let i = 0; i < n; ++i) {
  let frag = templ.cloneNode(true).content;
  manyCLinks.push(frag.querySelector(`.link`));
  manyC.append(frag);

  frag = templ.cloneNode(true).content;
  manyWLinks.push(frag.querySelector(`.link`));
  manyW.append(frag);
}

debugger;
manyC.addEventListener(`test`, cHandleEvent);
manyW.addEventListener(`test`, wHandleEvent);

Tests:

manyC
manyCLinks[(Math.random() * n)|0].dispatchEvent(new CustomEvent(`test`, {bubbles : true}));
manyW
manyWLinks[(Math.random() * n)|0].dispatchEvent(new CustomEvent(`test`, {bubbles : true}));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
manyC
manyW

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):

LLMs can make mistakes. Check important info.

It appears that we're dealing with a JavaScript benchmarking test case, specifically the `manyCLinks` and `manyWLinks` tests.

From the provided code snippet, I notice that the template string contains a repeating pattern of `<div>...</div>` elements. This is likely used to create multiple instances of an HTML element for each iteration in the benchmark loop.

The test cases themselves define two separate benchmarks:

1. `manyCLinks`: creates 1000 links and dispatches a custom event on each one.
2. `manyWLinks`: creates 500 links and dispatches a custom event on each one.

To answer your question, I'll provide a brief analysis of the latest benchmark result.

**Benchmark Results:**

The provided benchmark results show two sets of data:

1. **`manyWLinks`**: Chrome 108, Desktop, Windows
	* Executions per second: 64684.6484375
2. **`manyC`**: Chrome 108, Desktop, Windows
	* Executions per second: 75884.9140625

**Observations:**

1. The `manyWLinks` test is executed approximately 11% slower than the `manyCLinks` test.
2. Both tests are executed on a desktop platform with Windows as the operating system.

Please note that these results are specific to this particular benchmarking test case and may not be representative of real-world performance. If you have any further questions or would like me to elaborate on any aspect of the analysis, feel free to ask!

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Browser/OS: Chrome 108 on Windows

View result in a separate tab

Test name	Executions per second
manyC	64684.6 Ops/sec
manyW	75884.9 Ops/sec

Related benchmarks:

event delegation: closest vs cached (version: 0)

Comparing performance of: manyC vs manyW

Created: 4 years ago by: Registered User

Jump to the latest result

manyC

manyW

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):